21037370253 has 4 divisors (see below), whose sum is σ = 28049827008. Its totient is φ = 14024913500.

The previous prime is 21037370251. The next prime is 21037370287. The reversal of 21037370253 is 35207373012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21037370253 - 2¹ = 21037370251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21037370251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3506228373 + ... + 3506228378.

It is an arithmetic number, because the mean of its divisors is an integer number (7012456752).

Almost surely, 2^21037370253 is an apocalyptic number.

It is an amenable number.

21037370253 is a deficient number, since it is larger than the sum of its proper divisors (7012456755).

21037370253 is an equidigital number, since it uses as much as digits as its factorization.

21037370253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7012456754.

The product of its (nonzero) digits is 26460, while the sum is 33.

The spelling of 21037370253 in words is "twenty-one billion, thirty-seven million, three hundred seventy thousand, two hundred fifty-three".