21252741455 has 32 divisors (see below), whose sum is σ = 28786876416. Its totient is φ = 14922720000.

The previous prime is 21252741401. The next prime is 21252741457. The reversal of 21252741455 is 55414725212.

It is not a de Polignac number, because 21252741455 - 2²⁶ = 21185632591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252741457) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 720395 + ... + 749315.

It is an arithmetic number, because the mean of its divisors is an integer number (899589888).

Almost surely, 2^21252741455 is an apocalyptic number.

21252741455 is a deficient number, since it is larger than the sum of its proper divisors (7534134961).

21252741455 is a wasteful number, since it uses less digits than its factorization.

21252741455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29399.

The product of its digits is 112000, while the sum is 38.

The spelling of 21252741455 in words is "twenty-one billion, two hundred fifty-two million, seven hundred forty-one thousand, four hundred fifty-five".