21273402 has 8 divisors (see below), whose sum is σ = 42546816. Its totient is φ = 7091132.

The previous prime is 21273391. The next prime is 21273431. The reversal of 21273402 is 20437212.

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

21273402 is an admirable number.

It is a super-3 number, since 3×21273402³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1772778 + ... + 1772789.

It is an arithmetic number, because the mean of its divisors is an integer number (5318352).

Almost surely, 2^21273402 is an apocalyptic number.

21273402 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.

21273402 is a wasteful number, since it uses less digits than its factorization.

21273402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3545572.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 21273402 is about 4612.3098334782. The cubic root of 21273402 is about 277.0845532474.

The spelling of 21273402 in words is "twenty-one million, two hundred seventy-three thousand, four hundred two".