1021621131 has 6 divisors (see below), whose sum is σ = 1475674980. Its totient is φ = 681080748.

The previous prime is 1021621099. The next prime is 1021621157. The reversal of 1021621131 is 1311261201.

1021621131 is a `hidden beast` number, since 10 + 2 + 1 + 621 + 1 + 31 = 666.

It is not a de Polignac number, because 1021621131 - 2⁵ = 1021621099 is a prime.

It is a super-2 number, since 2×1021621131² = 2087419470611438322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1021621631) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 56756721 + ... + 56756738.

It is an arithmetic number, because the mean of its divisors is an integer number (245945830).

Almost surely, 2^1021621131 is an apocalyptic number.

1021621131 is a deficient number, since it is larger than the sum of its proper divisors (454053849).

1021621131 is a wasteful number, since it uses less digits than its factorization.

1021621131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113513465 (or 113513462 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1021621131 is about 31962.8085593241. The cubic root of 1021621131 is about 1007.1557172429.

Adding to 1021621131 its reverse (1311261201), we get a palindrome (2332882332).

The spelling of 1021621131 in words is "one billion, twenty-one million, six hundred twenty-one thousand, one hundred thirty-one".