21155002555243 has 8 divisors (see below), whose sum is σ = 21295186260480. Its totient is φ = 21015063287400.

The previous prime is 21155002555217. The next prime is 21155002555249. The reversal of 21155002555243 is 34255520055112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21155002555243 - 2²⁵ = 21154969000811 is a prime.

It is a super-2 number, since 2×21155002555243² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21155002555196 and 21155002555205.

It is not an unprimeable number, because it can be changed into a prime (21155002555249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60935683 + ... + 61281868.

It is an arithmetic number, because the mean of its divisors is an integer number (2661898282560).

Almost surely, 2^{21155002555243} is an apocalyptic number.

21155002555243 is a deficient number, since it is larger than the sum of its proper divisors (140183705237).

21155002555243 is a wasteful number, since it uses less digits than its factorization.

21155002555243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122218697.

The product of its (nonzero) digits is 300000, while the sum is 40.

The spelling of 21155002555243 in words is "twenty-one trillion, one hundred fifty-five billion, two million, five hundred fifty-five thousand, two hundred forty-three".