23011115421 has 16 divisors (see below), whose sum is σ = 35066908800. Its totient is φ = 13148326848.

The previous prime is 23011115419. The next prime is 23011115437. The reversal of 23011115421 is 12451111032.

It is not a de Polignac number, because 23011115421 - 2¹ = 23011115419 is a prime.

It is a super-2 number, since 2×23011115421² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23011115411) 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, 410215 + ... + 462923.

It is an arithmetic number, because the mean of its divisors is an integer number (2191681800).

Almost surely, 2^23011115421 is an apocalyptic number.

23011115421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23011115421 is a deficient number, since it is larger than the sum of its proper divisors (12055793379).

23011115421 is a wasteful number, since it uses less digits than its factorization.

23011115421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73508.

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 23011115421 its reverse (12451111032), we get a palindrome (35462226453).

The spelling of 23011115421 in words is "twenty-three billion, eleven million, one hundred fifteen thousand, four hundred twenty-one".