21020031332 has 12 divisors (see below), whose sum is σ = 36810627840. Its totient is φ = 10502709096.

The previous prime is 21020031313. The next prime is 21020031349. The reversal of 21020031332 is 23313002012.

It is a self number, because there is not a number n which added to its sum of digits gives 21020031332.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1820168 + ... + 1831679.

It is an arithmetic number, because the mean of its divisors is an integer number (3067552320).

Almost surely, 2^21020031332 is an apocalyptic number.

It is an amenable number.

21020031332 is a deficient number, since it is larger than the sum of its proper divisors (15790596508).

21020031332 is a wasteful number, since it uses less digits than its factorization.

21020031332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3653290 (or 3653288 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21020031332 its reverse (23313002012), we get a palindrome (44333033344).

The spelling of 21020031332 in words is "twenty-one billion, twenty million, thirty-one thousand, three hundred thirty-two".