21621337442106 has 32 divisors (see below), whose sum is σ = 43728984544320. Its totient is φ = 7126062489216.

The previous prime is 21621337442101. The next prime is 21621337442137. The reversal of 21621337442106 is 60124473312612.

It is not an unprimeable number, because it can be changed into a prime (21621337442101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96898740 + ... + 97121616.

It is an arithmetic number, because the mean of its divisors is an integer number (1366530767010).

Almost surely, 2^{21621337442106} is an apocalyptic number.

21621337442106 is an abundant number, since it is smaller than the sum of its proper divisors (22107647102214).

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

21621337442106 is a wasteful number, since it uses less digits than its factorization.

21621337442106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404638.

The product of its (nonzero) digits is 290304, while the sum is 42.

The spelling of 21621337442106 in words is "twenty-one trillion, six hundred twenty-one billion, three hundred thirty-seven million, four hundred forty-two thousand, one hundred six".