21820590278994 has 32 divisors (see below), whose sum is σ = 49041594209664. Its totient is φ = 6422113526400.

The previous prime is 21820590278983. The next prime is 21820590278999. The reversal of 21820590278994 is 49987209502812.

It is a super-2 number, since 2×21820590278994² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21820590278999) 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, 6081545107 + ... + 6081548694.

It is an arithmetic number, because the mean of its divisors is an integer number (1532549819052).

Almost surely, 2^{21820590278994} is an apocalyptic number.

21820590278994 is an abundant number, since it is smaller than the sum of its proper divisors (27221003930670).

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

21820590278994 is a wasteful number, since it uses less digits than its factorization.

21820590278994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12163093842.

The product of its (nonzero) digits is 52254720, while the sum is 66.

The spelling of 21820590278994 in words is "twenty-one trillion, eight hundred twenty billion, five hundred ninety million, two hundred seventy-eight thousand, nine hundred ninety-four".