20972042129 has 16 divisors (see below), whose sum is σ = 23382334080. Its totient is φ = 18693192960.

The previous prime is 20972042107. The next prime is 20972042171. The reversal of 20972042129 is 92124027902.

It is a cyclic number.

It is not a de Polignac number, because 20972042129 - 2⁸ = 20972041873 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20972042092 and 20972042101.

It is not an unprimeable number, because it can be changed into a prime (20972042629) 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, 1124807 + ... + 1143299.

It is an arithmetic number, because the mean of its divisors is an integer number (1461395880).

Almost surely, 2^20972042129 is an apocalyptic number.

It is an amenable number.

20972042129 is a deficient number, since it is larger than the sum of its proper divisors (2410291951).

20972042129 is a wasteful number, since it uses less digits than its factorization.

20972042129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22040.

The product of its (nonzero) digits is 36288, while the sum is 38.

The spelling of 20972042129 in words is "twenty billion, nine hundred seventy-two million, forty-two thousand, one hundred twenty-nine".