21474377751544 has 32 divisors (see below), whose sum is σ = 43845145146000. Its totient is φ = 9821312508672.

The previous prime is 21474377751473. The next prime is 21474377751553. The reversal of 21474377751544 is 44515777347412.

It is a super-2 number, since 2×21474377751544² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2435836989 + ... + 2435845804.

Almost surely, 2^{21474377751544} is an apocalyptic number.

It is an amenable number.

21474377751544 is an abundant number, since it is smaller than the sum of its proper divisors (22370767394456).

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

21474377751544 is a wasteful number, since it uses less digits than its factorization.

21474377751544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4871682847 (or 4871682843 counting only the distinct ones).

The product of its digits is 92198400, while the sum is 61.

The spelling of 21474377751544 in words is "twenty-one trillion, four hundred seventy-four billion, three hundred seventy-seven million, seven hundred fifty-one thousand, five hundred forty-four".