21273102 has 12 divisors (see below), whose sum is σ = 46091760. Its totient is φ = 7091028.

The previous prime is 21273101. The next prime is 21273107. The reversal of 21273102 is 20137212.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1181839 = 21273102 / (2 + 1 + 2 + 7 + 3 + 1 + 0 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21273101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 590902 + ... + 590937.

It is an arithmetic number, because the mean of its divisors is an integer number (3840980).

Almost surely, 2^21273102 is an apocalyptic number.

21273102 is an abundant number, since it is smaller than the sum of its proper divisors (24818658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21273102 is a wasteful number, since it uses less digits than its factorization.

21273102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181847 (or 1181844 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 21273102 is about 4612.2773116976. The cubic root of 21273102 is about 277.0832507484.

The spelling of 21273102 in words is "twenty-one million, two hundred seventy-three thousand, one hundred two".