21551321253032 has 16 divisors (see below), whose sum is σ = 40448775657300. Its totient is φ = 10764981077760.

The previous prime is 21551321252963. The next prime is 21551321253041. The reversal of 21551321253032 is 23035212315512.

It can be written as a sum of positive squares in 2 ways, for example, as 21285360323236 + 265960929796 = 4613606^2 + 515714^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21551321252983 and 21551321253001.

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, 1334935019 + ... + 1334951162.

Almost surely, 2^{21551321253032} is an apocalyptic number.

It is an amenable number.

21551321253032 is a deficient number, since it is larger than the sum of its proper divisors (18897454404268).

21551321253032 is a wasteful number, since it uses less digits than its factorization.

21551321253032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2669887196 (or 2669887192 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 35.

Adding to 21551321253032 its reverse (23035212315512), we get a palindrome (44586533568544).

The spelling of 21551321253032 in words is "twenty-one trillion, five hundred fifty-one billion, three hundred twenty-one million, two hundred fifty-three thousand, thirty-two".