20423195121 has 16 divisors (see below), whose sum is σ = 31142883200. Its totient is φ = 11662213248.

The previous prime is 20423195119. The next prime is 20423195141. The reversal of 20423195121 is 12159132402.

It is not a de Polignac number, because 20423195121 - 2¹ = 20423195119 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20423195101) 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, 310276 + ... + 370293.

It is an arithmetic number, because the mean of its divisors is an integer number (1946430200).

Almost surely, 2^20423195121 is an apocalyptic number.

20423195121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20423195121 is a deficient number, since it is larger than the sum of its proper divisors (10719688079).

20423195121 is a wasteful number, since it uses less digits than its factorization.

20423195121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682008.

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 20423195121 in words is "twenty billion, four hundred twenty-three million, one hundred ninety-five thousand, one hundred twenty-one".