21051822732 has 24 divisors (see below), whose sum is σ = 49176700272. Its totient is φ = 7009305600.

The previous prime is 21051822713. The next prime is 21051822761. The reversal of 21051822732 is 23722815012.

It is a junction number, because it is equal to n+sod(n) for n = 21051822693 and 21051822702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 985069 + ... + 1006212.

It is an arithmetic number, because the mean of its divisors is an integer number (2049029178).

Almost surely, 2^21051822732 is an apocalyptic number.

It is an amenable number.

21051822732 is an abundant number, since it is smaller than the sum of its proper divisors (28124877540).

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

21051822732 is a wasteful number, since it uses less digits than its factorization.

21051822732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992169 (or 1992167 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The spelling of 21051822732 in words is "twenty-one billion, fifty-one million, eight hundred twenty-two thousand, seven hundred thirty-two".