31642021021 has 24 divisors (see below), whose sum is σ = 34525370880. Its totient is φ = 28827323424.

The previous prime is 31642020973. The next prime is 31642021031. The reversal of 31642021021 is 12012024613.

It is not a de Polignac number, because 31642021021 - 2¹¹ = 31642018973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31642020983 and 31642021001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31642021031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66058260 + ... + 66058738.

It is an arithmetic number, because the mean of its divisors is an integer number (1438557120).

Almost surely, 2^31642021021 is an apocalyptic number.

It is an amenable number.

31642021021 is a deficient number, since it is larger than the sum of its proper divisors (2883349859).

31642021021 is a wasteful number, since it uses less digits than its factorization.

31642021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033 (or 894 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 31642021021 its reverse (12012024613), we get a palindrome (43654045634).

The spelling of 31642021021 in words is "thirty-one billion, six hundred forty-two million, twenty-one thousand, twenty-one".