21220090374 has 32 divisors (see below), whose sum is σ = 49298201856. Its totient is φ = 5963490720.

The previous prime is 21220090357. The next prime is 21220090379. The reversal of 21220090374 is 47309002212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220090379) 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, 4138752 + ... + 4143875.

It is an arithmetic number, because the mean of its divisors is an integer number (1540568808).

Almost surely, 2^21220090374 is an apocalyptic number.

21220090374 is an abundant number, since it is smaller than the sum of its proper divisors (28078111482).

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

21220090374 is a wasteful number, since it uses less digits than its factorization.

21220090374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8282700.

The product of its (nonzero) digits is 6048, while the sum is 30.

Adding to 21220090374 its reverse (47309002212), we get a palindrome (68529092586).

The spelling of 21220090374 in words is "twenty-one billion, two hundred twenty million, ninety thousand, three hundred seventy-four".