21273887313 has 24 divisors (see below), whose sum is σ = 35375154048. Its totient is φ = 12067768512.

The previous prime is 21273887293. The next prime is 21273887333. The reversal of 21273887313 is 31378837212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21273887293) and next prime (21273887333).

It is not a de Polignac number, because 21273887313 - 2⁵ = 21273887281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21273887333) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1223781 + ... + 1241042.

It is an arithmetic number, because the mean of its divisors is an integer number (1473964752).

Almost surely, 2^21273887313 is an apocalyptic number.

It is an amenable number.

21273887313 is a deficient number, since it is larger than the sum of its proper divisors (14101266735).

21273887313 is a wasteful number, since it uses less digits than its factorization.

21273887313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2464973 (or 2464970 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The spelling of 21273887313 in words is "twenty-one billion, two hundred seventy-three million, eight hundred eighty-seven thousand, three hundred thirteen".