20013121023 has 16 divisors (see below), whose sum is σ = 31239995136. Its totient is φ = 11157140160.

The previous prime is 20013121003. The next prime is 20013121027. The reversal of 20013121023 is 32012131002.

It is not a de Polignac number, because 20013121023 - 2⁵ = 20013120991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20013120993 and 20013121011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013121027) 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, 11621161 + ... + 11622882.

It is an arithmetic number, because the mean of its divisors is an integer number (1952499696).

Almost surely, 2^20013121023 is an apocalyptic number.

20013121023 is a deficient number, since it is larger than the sum of its proper divisors (11226874113).

20013121023 is a wasteful number, since it uses less digits than its factorization.

20013121023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23244094.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20013121023 its reverse (32012131002), we get a palindrome (52025252025).

The spelling of 20013121023 in words is "twenty billion, thirteen million, one hundred twenty-one thousand, twenty-three".