21958422 has 16 divisors (see below), whose sum is σ = 45826560. Its totient is φ = 7001192.

The previous prime is 21958421. The next prime is 21958429. The reversal of 21958422 is 22485912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21958421) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 79422 + ... + 79697.

It is an arithmetic number, because the mean of its divisors is an integer number (2864160).

Almost surely, 2^21958422 is an apocalyptic number.

21958422 is an abundant number, since it is smaller than the sum of its proper divisors (23868138).

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

21958422 is a wasteful number, since it uses less digits than its factorization.

21958422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159147.

The product of its digits is 11520, while the sum is 33.

The square root of 21958422 is about 4685.9814340221. The cubic root of 21958422 is about 280.0273017596.

The spelling of 21958422 in words is "twenty-one million, nine hundred fifty-eight thousand, four hundred twenty-two".