20001121023 has 64 divisors (see below), whose sum is σ = 29558430720. Its totient is φ = 11956267008.

The previous prime is 20001120977. The next prime is 20001121031. The reversal of 20001121023 is 32012110002.

It is not a de Polignac number, because 20001121023 - 2¹⁷ = 20000989951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001121123) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 63094861 + ... + 63095177.

It is an arithmetic number, because the mean of its divisors is an integer number (461850480).

Almost surely, 2^20001121023 is an apocalyptic number.

20001121023 is a deficient number, since it is larger than the sum of its proper divisors (9557309697).

20001121023 is a wasteful number, since it uses less digits than its factorization.

20001121023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 20001121023 its reverse (32012110002), we get a palindrome (52013231025).

The spelling of 20001121023 in words is "twenty billion, one million, one hundred twenty-one thousand, twenty-three".