1021011620 has 12 divisors (see below), whose sum is σ = 2144124444. Its totient is φ = 408404640.

The previous prime is 1021011587. The next prime is 1021011637. The reversal of 1021011620 is 261101201.

It can be written as a sum of positive squares in 2 ways, for example, as 682672384 + 338339236 = 26128^2 + 18394^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1021011595 and 1021011604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25525271 + ... + 25525310.

It is an arithmetic number, because the mean of its divisors is an integer number (178677037).

Almost surely, 2^1021011620 is an apocalyptic number.

1021011620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021011620 is an abundant number, since it is smaller than the sum of its proper divisors (1123112824).

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

1021011620 is a wasteful number, since it uses less digits than its factorization.

1021011620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51050590 (or 51050588 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1021011620 is about 31953.2724458701. The cubic root of 1021011620 is about 1006.9553838084.

Adding to 1021011620 its reverse (261101201), we get a palindrome (1282112821).

The spelling of 1021011620 in words is "one billion, twenty-one million, eleven thousand, six hundred twenty".