21442978029 has 32 divisors (see below), whose sum is σ = 32843496960. Its totient is φ = 12307204800.

The previous prime is 21442978019. The next prime is 21442978043. The reversal of 21442978029 is 92087924412.

It is a happy number.

It is not a de Polignac number, because 21442978029 - 2²⁴ = 21426200813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21442978019) 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, 2451594 + ... + 2460324.

It is an arithmetic number, because the mean of its divisors is an integer number (1026359280).

Almost surely, 2^21442978029 is an apocalyptic number.

It is an amenable number.

21442978029 is a deficient number, since it is larger than the sum of its proper divisors (11400518931).

21442978029 is a wasteful number, since it uses less digits than its factorization.

21442978029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12681.

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 21442978029 in words is "twenty-one billion, four hundred forty-two million, nine hundred seventy-eight thousand, twenty-nine".