1210521040 has 160 divisors (see below), whose sum is σ = 3077079840. Its totient is φ = 441188352.

The previous prime is 1210521031. The next prime is 1210521071. The reversal of 1210521040 is 401250121.

It can be written as a sum of positive squares in 16 ways, for example, as 187032976 + 1023488064 = 13676^2 + 31992^2 .

It is a super-2 number, since 2×1210521040² = 2930722376565363200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8835852 + ... + 8835988.

It is an arithmetic number, because the mean of its divisors is an integer number (19231749).

Almost surely, 2^1210521040 is an apocalyptic number.

1210521040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1210521040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1538539920).

1210521040 is an abundant number, since it is smaller than the sum of its proper divisors (1866558800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1210521040 is a wasteful number, since it uses less digits than its factorization.

1210521040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1210521040 is about 34792.5428791861. The cubic root of 1210521040 is about 1065.7551683681.

Adding to 1210521040 its reverse (401250121), we get a palindrome (1611771161).

The spelling of 1210521040 in words is "one billion, two hundred ten million, five hundred twenty-one thousand, forty".