21329441455 has 16 divisors (see below), whose sum is σ = 29438130240. Its totient is φ = 14532740352.

The previous prime is 21329441389. The next prime is 21329441461. The reversal of 21329441455 is 55414492312.

It is a cyclic number.

It is not a de Polignac number, because 21329441455 - 2⁷ = 21329441327 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1935310 + ... + 1946299.

It is an arithmetic number, because the mean of its divisors is an integer number (1839883140).

Almost surely, 2^21329441455 is an apocalyptic number.

21329441455 is a deficient number, since it is larger than the sum of its proper divisors (8108688785).

21329441455 is a wasteful number, since it uses less digits than its factorization.

21329441455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3881778.

The product of its digits is 172800, while the sum is 40.

The spelling of 21329441455 in words is "twenty-one billion, three hundred twenty-nine million, four hundred forty-one thousand, four hundred fifty-five".