21339430851552 has 96 divisors (see below), whose sum is σ = 62261358445440. Its totient is φ = 6344484856320.

The previous prime is 21339430851547. The next prime is 21339430851623. The reversal of 21339430851552 is 25515803493312.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 21339430851495 and 21339430851504.

It is a congruent number.

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, 190583602 + ... + 190695537.

It is an arithmetic number, because the mean of its divisors is an integer number (648555817140).

Almost surely, 2^{21339430851552} is an apocalyptic number.

21339430851552 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21339430851552 is an abundant number, since it is smaller than the sum of its proper divisors (40921927593888).

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

21339430851552 is a wasteful number, since it uses less digits than its factorization.

21339430851552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381279216 (or 381279208 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 51.

The spelling of 21339430851552 in words is "twenty-one trillion, three hundred thirty-nine billion, four hundred thirty million, eight hundred fifty-one thousand, five hundred fifty-two".