23540121551 has 4 divisors (see below), whose sum is σ = 23540498592. Its totient is φ = 23539744512.

The previous prime is 23540121533. The next prime is 23540121569. The reversal of 23540121551 is 15512104532.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (23540121533) and next prime (23540121569).

It is a cyclic number.

It is not a de Polignac number, because 23540121551 - 2⁶ = 23540121487 is a prime.

It is a super-3 number, since 3×23540121551³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23540121571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70055 + ... + 228008.

It is an arithmetic number, because the mean of its divisors is an integer number (5885124648).

Almost surely, 2^23540121551 is an apocalyptic number.

23540121551 is a deficient number, since it is larger than the sum of its proper divisors (377041).

23540121551 is an equidigital number, since it uses as much as digits as its factorization.

23540121551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377040.

The product of its (nonzero) digits is 6000, while the sum is 29.

The spelling of 23540121551 in words is "twenty-three billion, five hundred forty million, one hundred twenty-one thousand, five hundred fifty-one".