21355331432 has 64 divisors (see below), whose sum is σ = 40957163520. Its totient is φ = 10437009408.

The previous prime is 21355331423. The next prime is 21355331441. The reversal of 21355331432 is 23413355312.

It is an interprime number because it is at equal distance from previous prime (21355331423) and next prime (21355331441).

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 15 ways as a sum of consecutive naturals, for example, 33211703 + ... + 33212345.

It is an arithmetic number, because the mean of its divisors is an integer number (639955680).

Almost surely, 2^21355331432 is an apocalyptic number.

It is an amenable number.

21355331432 is a deficient number, since it is larger than the sum of its proper divisors (19601832088).

21355331432 is a wasteful number, since it uses less digits than its factorization.

21355331432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210 (or 1206 counting only the distinct ones).

The product of its digits is 32400, while the sum is 32.

Adding to 21355331432 its reverse (23413355312), we get a palindrome (44768686744).

The spelling of 21355331432 in words is "twenty-one billion, three hundred fifty-five million, three hundred thirty-one thousand, four hundred thirty-two".