21901422 has 8 divisors (see below), whose sum is σ = 43802856. Its totient is φ = 7300472.

The previous prime is 21901403. The next prime is 21901427. The reversal of 21901422 is 22410912.

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

21901422 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21901427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1825113 + ... + 1825124.

It is an arithmetic number, because the mean of its divisors is an integer number (5475357).

Almost surely, 2^21901422 is an apocalyptic number.

21901422 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.

21901422 is a wasteful number, since it uses less digits than its factorization.

21901422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3650242.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21901422 is about 4679.8955116541. The cubic root of 21901422 is about 279.7847921167.

The spelling of 21901422 in words is "twenty-one million, nine hundred one thousand, four hundred twenty-two".