21204414123144 has 64 divisors (see below), whose sum is σ = 64147807440000. Its totient is φ = 5702027326464.

The previous prime is 21204414123121. The next prime is 21204414123157. The reversal of 21204414123144 is 44132141440212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3712254519 + ... + 3712260230.

It is an arithmetic number, because the mean of its divisors is an integer number (1002309491250).

Almost surely, 2^{21204414123144} is an apocalyptic number.

21204414123144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21204414123144 is an abundant number, since it is smaller than the sum of its proper divisors (42943393316856).

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

21204414123144 is a wasteful number, since it uses less digits than its factorization.

21204414123144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7424514782 (or 7424514778 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 33.

Adding to 21204414123144 its reverse (44132141440212), we get a palindrome (65336555563356).

The spelling of 21204414123144 in words is "twenty-one trillion, two hundred four billion, four hundred fourteen million, one hundred twenty-three thousand, one hundred forty-four".