21437354787229 has 16 divisors (see below), whose sum is σ = 22916854609920. Its totient is φ = 19983052995840.

The previous prime is 21437354787179. The next prime is 21437354787283. The reversal of 21437354787229 is 92278745373412.

It is a cyclic number.

It is not a de Polignac number, because 21437354787229 - 2⁹ = 21437354786717 is a prime.

It is a super-2 number, since 2×21437354787229² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21437354782229) 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, 13671729 + ... + 15158854.

It is an arithmetic number, because the mean of its divisors is an integer number (1432303413120).

Almost surely, 2^{21437354787229} is an apocalyptic number.

It is an amenable number.

21437354787229 is a deficient number, since it is larger than the sum of its proper divisors (1479499822691).

21437354787229 is a wasteful number, since it uses less digits than its factorization.

21437354787229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28831020.

The product of its digits is 142248960, while the sum is 64.

The spelling of 21437354787229 in words is "twenty-one trillion, four hundred thirty-seven billion, three hundred fifty-four million, seven hundred eighty-seven thousand, two hundred twenty-nine".