21052091454 has 16 divisors (see below), whose sum is σ = 42155352192. Its totient is φ = 7008835608.

The previous prime is 21052091399. The next prime is 21052091461. The reversal of 21052091454 is 45419025012.

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, 2126704 + ... + 2136579.

It is an arithmetic number, because the mean of its divisors is an integer number (2634709512).

Almost surely, 2^21052091454 is an apocalyptic number.

21052091454 is an abundant number, since it is smaller than the sum of its proper divisors (21103260738).

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

21052091454 is a wasteful number, since it uses less digits than its factorization.

21052091454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4264111.

The product of its (nonzero) digits is 14400, while the sum is 33.

The spelling of 21052091454 in words is "twenty-one billion, fifty-two million, ninety-one thousand, four hundred fifty-four".