21205337159090 has 128 divisors (see below), whose sum is σ = 45787306586112. Its totient is φ = 6913339234560.

The previous prime is 21205337159089. The next prime is 21205337159093. The reversal of 21205337159090 is 9095173350212.

It is a super-3 number, since 3×21205337159090³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21205337159093) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 898405229 + ... + 898428831.

It is an arithmetic number, because the mean of its divisors is an integer number (357713332704).

Almost surely, 2^{21205337159090} is an apocalyptic number.

21205337159090 is an abundant number, since it is smaller than the sum of its proper divisors (24581969427022).

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

21205337159090 is a wasteful number, since it uses less digits than its factorization.

21205337159090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26904.

The product of its (nonzero) digits is 510300, while the sum is 47.

The spelling of 21205337159090 in words is "twenty-one trillion, two hundred five billion, three hundred thirty-seven million, one hundred fifty-nine thousand, ninety".