21214025131664 has 80 divisors (see below), whose sum is σ = 44386569077760. Its totient is φ = 9793310461440.

The previous prime is 21214025131597. The next prime is 21214025131697. The reversal of 21214025131664 is 46613152041212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2047514 + ... + 6827910.

It is an arithmetic number, because the mean of its divisors is an integer number (554832113472).

Almost surely, 2^{21214025131664} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21214025131664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22193284538880).

21214025131664 is an abundant number, since it is smaller than the sum of its proper divisors (23172543946096).

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

21214025131664 is a wasteful number, since it uses less digits than its factorization.

21214025131664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4780848 (or 4780842 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

Adding to 21214025131664 its reverse (46613152041212), we get a palindrome (67827177172876).

The spelling of 21214025131664 in words is "twenty-one trillion, two hundred fourteen billion, twenty-five million, one hundred thirty-one thousand, six hundred sixty-four".