21437001351 has 32 divisors (see below), whose sum is σ = 34883520000. Its totient is φ = 12950492544.

The previous prime is 21437001337. The next prime is 21437001367. The reversal of 21437001351 is 15310073412.

It is not a de Polignac number, because 21437001351 - 2²² = 21432807047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21437001851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 896626 + ... + 920223.

It is an arithmetic number, because the mean of its divisors is an integer number (1090110000).

Almost surely, 2^21437001351 is an apocalyptic number.

21437001351 is a deficient number, since it is larger than the sum of its proper divisors (13446518649).

21437001351 is a wasteful number, since it uses less digits than its factorization.

21437001351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1816900 (or 1816894 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

Adding to 21437001351 its reverse (15310073412), we get a palindrome (36747074763).

The spelling of 21437001351 in words is "twenty-one billion, four hundred thirty-seven million, one thousand, three hundred fifty-one".