21255365423541 has 8 divisors (see below), whose sum is σ = 28340616753504. Its totient is φ = 14170178854640.

The previous prime is 21255365423429. The next prime is 21255365423623. The reversal of 21255365423541 is 14532456355212.

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 21255365423541 - 2³¹ = 21253217939893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21255365423741) 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, 15419190 + ... + 16741031.

It is an arithmetic number, because the mean of its divisors is an integer number (3542577094188).

Almost surely, 2^{21255365423541} is an apocalyptic number.

It is an amenable number.

21255365423541 is a deficient number, since it is larger than the sum of its proper divisors (7085251329963).

21255365423541 is a wasteful number, since it uses less digits than its factorization.

21255365423541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32380531.

The product of its digits is 4320000, while the sum is 48.

The spelling of 21255365423541 in words is "twenty-one trillion, two hundred fifty-five billion, three hundred sixty-five million, four hundred twenty-three thousand, five hundred forty-one".