21426157357 has 12 divisors (see below), whose sum is σ = 24434442144. Its totient is φ = 18631436120.

The previous prime is 21426157303. The next prime is 21426157393. The reversal of 21426157357 is 75375162412.

It is a happy number.

It is not a de Polignac number, because 21426157357 - 2¹⁵ = 21426124589 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 (21426157057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1835233 + ... + 1846870.

It is an arithmetic number, because the mean of its divisors is an integer number (2036203512).

Almost surely, 2^21426157357 is an apocalyptic number.

It is an amenable number.

21426157357 is a deficient number, since it is larger than the sum of its proper divisors (3008284787).

21426157357 is a wasteful number, since it uses less digits than its factorization.

21426157357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3682160 (or 3682137 counting only the distinct ones).

The product of its digits is 352800, while the sum is 43.

The spelling of 21426157357 in words is "twenty-one billion, four hundred twenty-six million, one hundred fifty-seven thousand, three hundred fifty-seven".