21322231755 has 32 divisors (see below), whose sum is σ = 37772483328. Its totient is φ = 10183747200.

The previous prime is 21322231739. The next prime is 21322231807. The reversal of 21322231755 is 55713222312.

It is not a de Polignac number, because 21322231755 - 2⁴ = 21322231739 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 953316 + ... + 975425.

It is an arithmetic number, because the mean of its divisors is an integer number (1180390104).

Almost surely, 2^21322231755 is an apocalyptic number.

21322231755 is a deficient number, since it is larger than the sum of its proper divisors (16450251573).

21322231755 is a wasteful number, since it uses less digits than its factorization.

21322231755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1928827.

The product of its digits is 25200, while the sum is 33.

The spelling of 21322231755 in words is "twenty-one billion, three hundred twenty-two million, two hundred thirty-one thousand, seven hundred fifty-five".