21213511590990 has 16 divisors (see below), whose sum is σ = 50912427818448. Its totient is φ = 5656936424256.

The previous prime is 21213511590989. The next prime is 21213511591021. The reversal of 21213511590990 is 9909511531212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353558526487 + ... + 353558526546.

It is an arithmetic number, because the mean of its divisors is an integer number (3182026738653).

Almost surely, 2^{21213511590990} is an apocalyptic number.

21213511590990 is an abundant number, since it is smaller than the sum of its proper divisors (29698916227458).

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

21213511590990 is a wasteful number, since it uses less digits than its factorization.

21213511590990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707117053043.

The product of its (nonzero) digits is 218700, while the sum is 48.

The spelling of 21213511590990 in words is "twenty-one trillion, two hundred thirteen billion, five hundred eleven million, five hundred ninety thousand, nine hundred ninety".