21255552146312 has 128 divisors (see below), whose sum is σ = 46232583736320. Its totient is φ = 9065408352000.

The previous prime is 21255552146273. The next prime is 21255552146327. The reversal of 21255552146312 is 21364125555212.

It is a Harshad number since it is a multiple of its sum of digits (44).

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, 653377487 + ... + 653410017.

It is an arithmetic number, because the mean of its divisors is an integer number (361192060440).

Almost surely, 2^{21255552146312} is an apocalyptic number.

21255552146312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21255552146312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23116291868160).

21255552146312 is an abundant number, since it is smaller than the sum of its proper divisors (24977031590008).

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

21255552146312 is a wasteful number, since it uses less digits than its factorization.

21255552146312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38715 (or 38711 counting only the distinct ones).

The product of its digits is 720000, while the sum is 44.

The spelling of 21255552146312 in words is "twenty-one trillion, two hundred fifty-five billion, five hundred fifty-two million, one hundred forty-six thousand, three hundred twelve".