21753449901492 has 96 divisors (see below), whose sum is σ = 54192301363200. Its totient is φ = 6771546646272.

The previous prime is 21753449901461. The next prime is 21753449901527. The reversal of 21753449901492 is 29410994435712.

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, 28905283 + ... + 29648309.

It is an arithmetic number, because the mean of its divisors is an integer number (564503139200).

Almost surely, 2^{21753449901492} 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 21753449901492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27096150681600).

21753449901492 is an abundant number, since it is smaller than the sum of its proper divisors (32438851461708).

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

21753449901492 is a wasteful number, since it uses less digits than its factorization.

21753449901492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744885 (or 744883 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 60.

The spelling of 21753449901492 in words is "twenty-one trillion, seven hundred fifty-three billion, four hundred forty-nine million, nine hundred one thousand, four hundred ninety-two".