21050405332 has 72 divisors (see below), whose sum is σ = 41327104896. Its totient is φ = 9372264000.

The previous prime is 21050405309. The next prime is 21050405339. The reversal of 21050405332 is 23350405012.

It is a junction number, because it is equal to n+sod(n) for n = 21050405297 and 21050405306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050405339) 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, 7763457 + ... + 7766167.

It is an arithmetic number, because the mean of its divisors is an integer number (573987568).

Almost surely, 2^21050405332 is an apocalyptic number.

21050405332 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21050405332 is a deficient number, since it is larger than the sum of its proper divisors (20276699564).

21050405332 is a wasteful number, since it uses less digits than its factorization.

21050405332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3061 (or 3048 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The spelling of 21050405332 in words is "twenty-one billion, fifty million, four hundred five thousand, three hundred thirty-two".