21939202 has 8 divisors (see below), whose sum is σ = 33674256. Its totient is φ = 10714452.

The previous prime is 21939179. The next prime is 21939233. The reversal of 21939202 is 20293912.

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

It is a super-3 number, since 3×21939202³ (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, 127468 + ... + 127639.

It is an arithmetic number, because the mean of its divisors is an integer number (4209282).

Almost surely, 2^21939202 is an apocalyptic number.

21939202 is a deficient number, since it is larger than the sum of its proper divisors (11735054).

21939202 is a wasteful number, since it uses less digits than its factorization.

21939202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255152.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 21939202 is about 4683.9301873534. The cubic root of 21939202 is about 279.9455761570.

The spelling of 21939202 in words is "twenty-one million, nine hundred thirty-nine thousand, two hundred two".