21237116140 has 24 divisors (see below), whose sum is σ = 44824337712. Its totient is φ = 8451723840.

The previous prime is 21237116123. The next prime is 21237116141. The reversal of 21237116140 is 4161173212.

It is a junction number, because it is equal to n+sod(n) for n = 21237116099 and 21237116108.

It is not an unprimeable number, because it can be changed into a prime (21237116141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2691126 + ... + 2699005.

It is an arithmetic number, because the mean of its divisors is an integer number (1867680738).

Almost surely, 2^21237116140 is an apocalyptic number.

21237116140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21237116140 is an abundant number, since it is smaller than the sum of its proper divisors (23587221572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21237116140 is a wasteful number, since it uses less digits than its factorization.

21237116140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5390337 (or 5390335 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

Adding to 21237116140 its reverse (4161173212), we get a palindrome (25398289352).

The spelling of 21237116140 in words is "twenty-one billion, two hundred thirty-seven million, one hundred sixteen thousand, one hundred forty".