21121221111023 has 8 divisors (see below), whose sum is σ = 23042550241920. Its totient is φ = 19200095000280.

The previous prime is 21121221111017. The next prime is 21121221111077. The reversal of 21121221111023 is 32011112212112.

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

It is a cyclic number.

It is not a de Polignac number, because 21121221111023 - 2⁶ = 21121221110959 is a prime.

It is a super-2 number, since 2×21121221111023² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121221110986 and 21121221111004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121221311023) 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, 50537465 + ... + 50953682.

It is an arithmetic number, because the mean of its divisors is an integer number (2880318780240).

Almost surely, 2^{21121221111023} is an apocalyptic number.

21121221111023 is a deficient number, since it is larger than the sum of its proper divisors (1921329130897).

21121221111023 is a wasteful number, since it uses less digits than its factorization.

21121221111023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101510077.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 21121221111023 its reverse (32011112212112), we get a palindrome (53132333323135).

The spelling of 21121221111023 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, twenty-three".