21872233544 has 32 divisors (see below), whose sum is σ = 46937776320. Its totient is φ = 9360073536.

The previous prime is 21872233543. The next prime is 21872233567. The reversal of 21872233544 is 44533227812.

It is not an unprimeable number, because it can be changed into a prime (21872233543) 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, 247679 + ... + 324174.

It is an arithmetic number, because the mean of its divisors is an integer number (1466805510).

Almost surely, 2^21872233544 is an apocalyptic number.

It is an amenable number.

21872233544 is an abundant number, since it is smaller than the sum of its proper divisors (25065542776).

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

21872233544 is a wasteful number, since it uses less digits than its factorization.

21872233544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572549 (or 572545 counting only the distinct ones).

The product of its digits is 322560, while the sum is 41.

The spelling of 21872233544 in words is "twenty-one billion, eight hundred seventy-two million, two hundred thirty-three thousand, five hundred forty-four".