21234545544 has 32 divisors (see below), whose sum is σ = 53956635840. Its totient is φ = 6962145600.

The previous prime is 21234545531. The next prime is 21234545603. The reversal of 21234545544 is 44554543212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7250772 + ... + 7253699.

It is an arithmetic number, because the mean of its divisors is an integer number (1686144870).

Almost surely, 2^21234545544 is an apocalyptic number.

21234545544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21234545544 is an abundant number, since it is smaller than the sum of its proper divisors (32722090296).

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

21234545544 is a wasteful number, since it uses less digits than its factorization.

21234545544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14504541 (or 14504537 counting only the distinct ones).

The product of its digits is 384000, while the sum is 39.

The spelling of 21234545544 in words is "twenty-one billion, two hundred thirty-four million, five hundred forty-five thousand, five hundred forty-four".