23221201545 has 24 divisors (see below), whose sum is σ = 40452360000. Its totient is φ = 12322401696.

The previous prime is 23221201543. The next prime is 23221201547. The reversal of 23221201545 is 54510212232.

It is an interprime number because it is at equal distance from previous prime (23221201543) and next prime (23221201547).

It is not a de Polignac number, because 23221201545 - 2¹ = 23221201543 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 1287595 + ... + 1305504.

It is an arithmetic number, because the mean of its divisors is an integer number (1685515000).

Almost surely, 2^23221201545 is an apocalyptic number.

It is an amenable number.

23221201545 is a deficient number, since it is larger than the sum of its proper divisors (17231158455).

23221201545 is a wasteful number, since it uses less digits than its factorization.

23221201545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2593309 (or 2593306 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 23221201545 its reverse (54510212232), we get a palindrome (77731413777).

The spelling of 23221201545 in words is "twenty-three billion, two hundred twenty-one million, two hundred one thousand, five hundred forty-five".