23221201540 has 24 divisors (see below), whose sum is σ = 49381799040. Its totient is φ = 9170904288.

The previous prime is 23221201501. The next prime is 23221201541. The reversal of 23221201540 is 4510212232.

It is a happy number.

It is a super-2 number, since 2×23221201540² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23221201541) 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, 7346902 + ... + 7350061.

It is an arithmetic number, because the mean of its divisors is an integer number (2057574960).

Almost surely, 2^23221201540 is an apocalyptic number.

23221201540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23221201540 is an abundant number, since it is smaller than the sum of its proper divisors (26160597500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23221201540 is a wasteful number, since it uses less digits than its factorization.

23221201540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14697051 (or 14697049 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 23221201540 its reverse (4510212232), we get a palindrome (27731413772).

The spelling of 23221201540 in words is "twenty-three billion, two hundred twenty-one million, two hundred one thousand, five hundred forty".