21124144501 has 8 divisors (see below), whose sum is σ = 22709047680. Its totient is φ = 19586551968.

The previous prime is 21124144499. The next prime is 21124144553. The reversal of 21124144501 is 10544142112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21124144501 - 2¹ = 21124144499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124148501) 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, 11826736 + ... + 11828521.

It is an arithmetic number, because the mean of its divisors is an integer number (2838630960).

Almost surely, 2^21124144501 is an apocalyptic number.

It is an amenable number.

21124144501 is a deficient number, since it is larger than the sum of its proper divisors (1584903179).

21124144501 is a wasteful number, since it uses less digits than its factorization.

21124144501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23655323.

The product of its (nonzero) digits is 1280, while the sum is 25.

Adding to 21124144501 its reverse (10544142112), we get a palindrome (31668286613).

The spelling of 21124144501 in words is "twenty-one billion, one hundred twenty-four million, one hundred forty-four thousand, five hundred one".