1210421772 has 96 divisors (see below), whose sum is σ = 3597834240. Its totient is φ = 344736000.

The previous prime is 1210421767. The next prime is 1210421789. The reversal of 1210421772 is 2771240121.

It is a happy number.

It is a super-2 number, since 2×1210421772² = 2930241732263239968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 252397 + ... + 257147.

It is an arithmetic number, because the mean of its divisors is an integer number (37477440).

Almost surely, 2^1210421772 is an apocalyptic number.

1210421772 is a gapful number since it is divisible by the number (12) 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 1210421772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1798917120).

1210421772 is an abundant number, since it is smaller than the sum of its proper divisors (2387412468).

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

1210421772 is a wasteful number, since it uses less digits than its factorization.

1210421772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5108 (or 5100 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 1210421772 is about 34791.1162798781. The cubic root of 1210421772 is about 1065.7260353825.

Adding to 1210421772 its reverse (2771240121), we get a palindrome (3981661893).

The spelling of 1210421772 in words is "one billion, two hundred ten million, four hundred twenty-one thousand, seven hundred seventy-two".