21120213155548 has 48 divisors (see below), whose sum is σ = 40109710072320. Its totient is φ = 9673044825600.

The previous prime is 21120213155519. The next prime is 21120213155549. The reversal of 21120213155548 is 84555131202112.

It is a self number, because there is not a number n which added to its sum of digits gives 21120213155548.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120213155549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1462578 + ... + 6661798.

It is an arithmetic number, because the mean of its divisors is an integer number (835618959840).

Almost surely, 2^{21120213155548} is an apocalyptic number.

It is an amenable number.

21120213155548 is a deficient number, since it is larger than the sum of its proper divisors (18989496916772).

21120213155548 is a wasteful number, since it uses less digits than its factorization.

21120213155548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5199838 (or 5199836 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 40.

The spelling of 21120213155548 in words is "twenty-one trillion, one hundred twenty billion, two hundred thirteen million, one hundred fifty-five thousand, five hundred forty-eight".