21120213155539 has 16 divisors (see below), whose sum is σ = 22340787840000. Its totient is φ = 19910656664640.

The previous prime is 21120213155519. The next prime is 21120213155549. The reversal of 21120213155539 is 93555131202112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21120213155539 - 2⁵ = 21120213155507 is a prime.

It is a super-3 number, since 3×21120213155539³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120213155519) 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, 4690599 + ... + 8015119.

It is an arithmetic number, because the mean of its divisors is an integer number (1396299240000).

Almost surely, 2^{21120213155539} is an apocalyptic number.

21120213155539 is a deficient number, since it is larger than the sum of its proper divisors (1220574684461).

21120213155539 is a wasteful number, since it uses less digits than its factorization.

21120213155539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3326178.

The product of its (nonzero) digits is 81000, while the sum is 40.

The spelling of 21120213155539 in words is "twenty-one trillion, one hundred twenty billion, two hundred thirteen million, one hundred fifty-five thousand, five hundred thirty-nine".