21216201024352 has 24 divisors (see below), whose sum is σ = 42898298357376. Its totient is φ = 10321395092352.

The previous prime is 21216201024341. The next prime is 21216201024391. The reversal of 21216201024352 is 25342010261212.

It is a happy number.

It is a congruent number.

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, 8959543168 + ... + 8959545535.

It is an arithmetic number, because the mean of its divisors is an integer number (1787429098224).

Almost surely, 2^{21216201024352} is an apocalyptic number.

It is an amenable number.

21216201024352 is an abundant number, since it is smaller than the sum of its proper divisors (21682097333024).

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

21216201024352 is a wasteful number, since it uses less digits than its factorization.

21216201024352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17919088750 (or 17919088742 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 21216201024352 its reverse (25342010261212), we get a palindrome (46558211285564).

The spelling of 21216201024352 in words is "twenty-one trillion, two hundred sixteen billion, two hundred one million, twenty-four thousand, three hundred fifty-two".