21451021452132 has 12 divisors (see below), whose sum is σ = 50052383388336. Its totient is φ = 7150340484040.

The previous prime is 21451021452127. The next prime is 21451021452149. The reversal of 21451021452132 is 23125412015412.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21451021452093 and 21451021452102.

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, 893792560494 + ... + 893792560517.

It is an arithmetic number, because the mean of its divisors is an integer number (4171031949028).

Almost surely, 2^{21451021452132} is an apocalyptic number.

It is an amenable number.

21451021452132 is an abundant number, since it is smaller than the sum of its proper divisors (28601361936204).

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

21451021452132 is a wasteful number, since it uses less digits than its factorization.

21451021452132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787585121018 (or 1787585121016 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 21451021452132 its reverse (23125412015412), we get a palindrome (44576433467544).

The spelling of 21451021452132 in words is "twenty-one trillion, four hundred fifty-one billion, twenty-one million, four hundred fifty-two thousand, one hundred thirty-two".