21121030023 has 8 divisors (see below), whose sum is σ = 28233769200. Its totient is φ = 14044488768.

The previous prime is 21121030001. The next prime is 21121030031. The reversal of 21121030023 is 32003012112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21121030023 - 2²¹ = 21118932871 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21121029984 and 21121030011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121030033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9048118 + ... + 9050451.

It is an arithmetic number, because the mean of its divisors is an integer number (3529221150).

Almost surely, 2^21121030023 is an apocalyptic number.

21121030023 is a deficient number, since it is larger than the sum of its proper divisors (7112739177).

21121030023 is a wasteful number, since it uses less digits than its factorization.

21121030023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18098961.

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

Adding to 21121030023 its reverse (32003012112), we get a palindrome (53124042135).

The spelling of 21121030023 in words is "twenty-one billion, one hundred twenty-one million, thirty thousand, twenty-three".