21253835212 has 12 divisors (see below), whose sum is σ = 37562471856. Its totient is φ = 10521700400.

The previous prime is 21253835179. The next prime is 21253835237.

21253835212 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21253835212² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 26303848 + ... + 26304655.

It is an arithmetic number, because the mean of its divisors is an integer number (3130205988).

Almost surely, 2^21253835212 is an apocalyptic number.

It is an amenable number.

21253835212 is a deficient number, since it is larger than the sum of its proper divisors (16308636644).

21253835212 is a wasteful number, since it uses less digits than its factorization.

21253835212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52608608 (or 52608606 counting only the distinct ones).

The product of its digits is 28800, while the sum is 34.

The spelling of 21253835212 in words is "twenty-one billion, two hundred fifty-three million, eight hundred thirty-five thousand, two hundred twelve".