21542234039 has 16 divisors (see below), whose sum is σ = 22019776800. Its totient is φ = 21071314944.

The previous prime is 21542234023. The next prime is 21542234059. The reversal of 21542234039 is 93043224512.

It is a cyclic number.

It is not a de Polignac number, because 21542234039 - 2⁴ = 21542234023 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 (21542234059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3084119 + ... + 3091095.

It is an arithmetic number, because the mean of its divisors is an integer number (1376236050).

Almost surely, 2^21542234039 is an apocalyptic number.

21542234039 is a deficient number, since it is larger than the sum of its proper divisors (477542761).

21542234039 is a wasteful number, since it uses less digits than its factorization.

21542234039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7442.

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 21542234039 in words is "twenty-one billion, five hundred forty-two million, two hundred thirty-four thousand, thirty-nine".