21137104750 has 16 divisors (see below), whose sum is σ = 39568660560. Its totient is φ = 8454841800.

The previous prime is 21137104739. The next prime is 21137104757. The reversal of 21137104750 is 5740173112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21137104757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42273960 + ... + 42274459.

It is an arithmetic number, because the mean of its divisors is an integer number (2473041285).

Almost surely, 2^21137104750 is an apocalyptic number.

21137104750 is a deficient number, since it is larger than the sum of its proper divisors (18431555810).

21137104750 is an equidigital number, since it uses as much as digits as its factorization.

21137104750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84548436 (or 84548426 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 31.

Adding to 21137104750 its reverse (5740173112), we get a palindrome (26877277862).

The spelling of 21137104750 in words is "twenty-one billion, one hundred thirty-seven million, one hundred four thousand, seven hundred fifty".