21203122023 has 12 divisors (see below), whose sum is σ = 31338981960. Its totient is φ = 13806683856.

The previous prime is 21203122009. The next prime is 21203122051. The reversal of 21203122023 is 32022130212.

It is not a de Polignac number, because 21203122023 - 2²² = 21198927719 is a prime.

It is a super-2 number, since 2×21203122023² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21203121987 and 21203122005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203122123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27393828 + ... + 27394601.

It is an arithmetic number, because the mean of its divisors is an integer number (2611581830).

Almost surely, 2^21203122023 is an apocalyptic number.

21203122023 is a deficient number, since it is larger than the sum of its proper divisors (10135859937).

21203122023 is a wasteful number, since it uses less digits than its factorization.

21203122023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54788478 (or 54788475 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21203122023 its reverse (32022130212), we get a palindrome (53225252235).

The spelling of 21203122023 in words is "twenty-one billion, two hundred three million, one hundred twenty-two thousand, twenty-three".