21042501144 has 64 divisors (see below), whose sum is σ = 60143888640. Its totient is φ = 6009897600.

The previous prime is 21042501131. The next prime is 21042501149. The reversal of 21042501144 is 44110524012.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042501149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 457002 + ... + 500934.

It is an arithmetic number, because the mean of its divisors is an integer number (939748260).

Almost surely, 2^21042501144 is an apocalyptic number.

21042501144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21042501144 is an abundant number, since it is smaller than the sum of its proper divisors (39101387496).

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

21042501144 is a wasteful number, since it uses less digits than its factorization.

21042501144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46800 (or 46796 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The spelling of 21042501144 in words is "twenty-one billion, forty-two million, five hundred one thousand, one hundred forty-four".