21273702 has 8 divisors (see below), whose sum is σ = 42547416. Its totient is φ = 7091232.

The previous prime is 21273683. The next prime is 21273709. The reversal of 21273702 is 20737212.

It is a sphenic number, since it is the product of 3 distinct primes.

21273702 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21273709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1772803 + ... + 1772814.

It is an arithmetic number, because the mean of its divisors is an integer number (5318427).

Almost surely, 2^21273702 is an apocalyptic number.

21273702 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21273702 is a wasteful number, since it uses less digits than its factorization.

21273702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3545622.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 21273702 is about 4612.3423550296. The cubic root of 21273702 is about 277.0858557342.

The spelling of 21273702 in words is "twenty-one million, two hundred seventy-three thousand, seven hundred two".