21261034616352 has 96 divisors (see below), whose sum is σ = 56220877742400. Its totient is φ = 7034870059008.

The previous prime is 21261034616273. The next prime is 21261034616413. The reversal of 21261034616352 is 25361643016212.

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

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, 294687099 + ... + 294759237.

It is an arithmetic number, because the mean of its divisors is an integer number (585634143150).

Almost surely, 2^{21261034616352} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21261034616352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28110438871200).

21261034616352 is an abundant number, since it is smaller than the sum of its proper divisors (34959843126048).

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

21261034616352 is a wasteful number, since it uses less digits than its factorization.

21261034616352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94698 (or 94690 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 21261034616352 in words is "twenty-one trillion, two hundred sixty-one billion, thirty-four million, six hundred sixteen thousand, three hundred fifty-two".