1021611220 has 48 divisors (see below), whose sum is σ = 2474398080. Its totient is φ = 347048064.

The previous prime is 1021611211. The next prime is 1021611221. The reversal of 1021611220 is 221161201.

1021611220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1021611194 and 1021611203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021611221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18214 + ... + 48733.

It is an arithmetic number, because the mean of its divisors is an integer number (51549960).

Almost surely, 2^1021611220 is an apocalyptic number.

1021611220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021611220 is an abundant number, since it is smaller than the sum of its proper divisors (1452786860).

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

1021611220 is a wasteful number, since it uses less digits than its factorization.

1021611220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67072 (or 67070 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1021611220 is about 31962.6535193810. The cubic root of 1021611220 is about 1007.1524603433.

Adding to 1021611220 its reverse (221161201), we get a palindrome (1242772421).

The spelling of 1021611220 in words is "one billion, twenty-one million, six hundred eleven thousand, two hundred twenty".