21142542780028 has 24 divisors (see below), whose sum is σ = 39505984898688. Its totient is φ = 9876496220976.

The previous prime is 21142542780013. The next prime is 21142542780089. The reversal of 21142542780028 is 82008724524112.

It is a super-2 number, since 2×21142542780028² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 21142542780028.

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, 2672208226 + ... + 2672216137.

It is an arithmetic number, because the mean of its divisors is an integer number (1646082704112).

Almost surely, 2^{21142542780028} is an apocalyptic number.

It is an amenable number.

21142542780028 is a deficient number, since it is larger than the sum of its proper divisors (18363442118660).

21142542780028 is a wasteful number, since it uses less digits than its factorization.

21142542780028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5344424433 (or 5344424431 counting only the distinct ones).

The product of its (nonzero) digits is 573440, while the sum is 46.

The spelling of 21142542780028 in words is "twenty-one trillion, one hundred forty-two billion, five hundred forty-two million, seven hundred eighty thousand, twenty-eight".