21511443841152 has 64 divisors (see below), whose sum is σ = 57141793116000. Its totient is φ = 7170227738624.

The previous prime is 21511443841141. The next prime is 21511443841169. The reversal of 21511443841152 is 25114834411512.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×21511443841152² (a number of 27 digits) contains 22 as substring.

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, 10043599 + ... + 11995697.

Almost surely, 2^{21511443841152} is an apocalyptic number.

It is an amenable number.

21511443841152 is an abundant number, since it is smaller than the sum of its proper divisors (35630349274848).

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

21511443841152 is a wasteful number, since it uses less digits than its factorization.

21511443841152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980813 (or 1980801 counting only the distinct ones).

The product of its digits is 153600, while the sum is 42.

The spelling of 21511443841152 in words is "twenty-one trillion, five hundred eleven billion, four hundred forty-three million, eight hundred forty-one thousand, one hundred fifty-two".