21690432882 has 40 divisors (see below), whose sum is σ = 49056906096. Its totient is φ = 7162567128.

The previous prime is 21690432871. The next prime is 21690432893. The reversal of 21690432882 is 28823409612.

It is an interprime number because it is at equal distance from previous prime (21690432871) and next prime (21690432893).

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 608328 + ... + 642995.

Almost surely, 2^21690432882 is an apocalyptic number.

21690432882 is an abundant number, since it is smaller than the sum of its proper divisors (27366473214).

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

21690432882 is a wasteful number, since it uses less digits than its factorization.

21690432882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251444 (or 1251435 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 21690432882 in words is "twenty-one billion, six hundred ninety million, four hundred thirty-two thousand, eight hundred eighty-two".