21402358 has 4 divisors (see below), whose sum is σ = 32103540. Its totient is φ = 10701178.

The previous prime is 21402331. The next prime is 21402373. The reversal of 21402358 is 85320412.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5350588 + ... + 5350591.

It is an arithmetic number, because the mean of its divisors is an integer number (8025885).

Almost surely, 2^21402358 is an apocalyptic number.

21402358 is a deficient number, since it is larger than the sum of its proper divisors (10701182).

21402358 is a wasteful number, since it uses less digits than its factorization.

21402358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10701181.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 21402358 is about 4626.2682585427. The cubic root of 21402358 is about 277.6433066588.

The spelling of 21402358 in words is "twenty-one million, four hundred two thousand, three hundred fifty-eight".