21440000157 has 4 divisors (see below), whose sum is σ = 28586666880. Its totient is φ = 14293333436.

The previous prime is 21440000111. The next prime is 21440000189. The reversal of 21440000157 is 75100004412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21440000157 - 2¹⁸ = 21439738013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440000107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3573333357 + ... + 3573333362.

It is an arithmetic number, because the mean of its divisors is an integer number (7146666720).

Almost surely, 2^21440000157 is an apocalyptic number.

It is an amenable number.

21440000157 is a deficient number, since it is larger than the sum of its proper divisors (7146666723).

21440000157 is an equidigital number, since it uses as much as digits as its factorization.

21440000157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7146666722.

The product of its (nonzero) digits is 1120, while the sum is 24.

Adding to 21440000157 its reverse (75100004412), we get a palindrome (96540004569).

The spelling of 21440000157 in words is "twenty-one billion, four hundred forty million, one hundred fifty-seven", and thus it is an aban number.