21121012023 has 16 divisors (see below), whose sum is σ = 28484707680. Its totient is φ = 13919907456.

The previous prime is 21121012021. The next prime is 21121012037. The reversal of 21121012023 is 32021012112.

It is not a de Polignac number, because 21121012023 - 2¹ = 21121012021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21121011993 and 21121012011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121012021) 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, 21028 + ... + 206601.

It is an arithmetic number, because the mean of its divisors is an integer number (1780294230).

Almost surely, 2^21121012023 is an apocalyptic number.

21121012023 is a deficient number, since it is larger than the sum of its proper divisors (7363695657).

21121012023 is a wasteful number, since it uses less digits than its factorization.

21121012023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227986.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21121012023 its reverse (32021012112), we get a palindrome (53142024135).

The spelling of 21121012023 in words is "twenty-one billion, one hundred twenty-one million, twelve thousand, twenty-three".