21260867860253 has 4 divisors (see below), whose sum is σ = 24298134697440. Its totient is φ = 18223601023068.

The previous prime is 21260867860223. The next prime is 21260867860261. The reversal of 21260867860253 is 35206876806212.

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 not a de Polignac number, because 21260867860253 - 2⁶ = 21260867860189 is a prime.

It is a super-2 number, since 2×21260867860253² (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 (21260867860223) 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, 1518633418583 + ... + 1518633418596.

It is an arithmetic number, because the mean of its divisors is an integer number (6074533674360).

Almost surely, 2^{21260867860253} is an apocalyptic number.

It is an amenable number.

21260867860253 is a deficient number, since it is larger than the sum of its proper divisors (3037266837187).

21260867860253 is an equidigital number, since it uses as much as digits as its factorization.

21260867860253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3037266837186.

The product of its (nonzero) digits is 11612160, while the sum is 56.

The spelling of 21260867860253 in words is "twenty-one trillion, two hundred sixty billion, eight hundred sixty-seven million, eight hundred sixty thousand, two hundred fifty-three".