21621362554102 has 8 divisors (see below), whose sum is σ = 32473253546136. Its totient is φ = 10796944705392.

The previous prime is 21621362554069. The next prime is 21621362554139. The reversal of 21621362554102 is 20145526312612.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 6868283863 + ... + 6868287010.

It is an arithmetic number, because the mean of its divisors is an integer number (4059156693267).

Almost surely, 2^{21621362554102} is an apocalyptic number.

21621362554102 is a deficient number, since it is larger than the sum of its proper divisors (10851890992034).

21621362554102 is a wasteful number, since it uses less digits than its factorization.

21621362554102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13736571662.

The product of its (nonzero) digits is 172800, while the sum is 40.

Adding to 21621362554102 its reverse (20145526312612), we get a palindrome (41766888866714).

The spelling of 21621362554102 in words is "twenty-one trillion, six hundred twenty-one billion, three hundred sixty-two million, five hundred fifty-four thousand, one hundred two".