21451844094 has 64 divisors (see below), whose sum is σ = 48473717760. Its totient is φ = 6288399360.

The previous prime is 21451844087. The next prime is 21451844107. The reversal of 21451844094 is 49044815412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65659 + ... + 217289.

It is an arithmetic number, because the mean of its divisors is an integer number (757401840).

Almost surely, 2^21451844094 is an apocalyptic number.

21451844094 is an abundant number, since it is smaller than the sum of its proper divisors (27021873666).

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

21451844094 is a wasteful number, since it uses less digits than its factorization.

21451844094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151745.

The product of its (nonzero) digits is 184320, while the sum is 42.

The spelling of 21451844094 in words is "twenty-one billion, four hundred fifty-one million, eight hundred forty-four thousand, ninety-four".