21901022 has 32 divisors (see below), whose sum is σ = 39160800. Its totient is φ = 9054720.

The previous prime is 21901021. The next prime is 21901051. The reversal of 21901022 is 22010912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21901021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20354 + ... + 21402.

It is an arithmetic number, because the mean of its divisors is an integer number (1223775).

Almost surely, 2^21901022 is an apocalyptic number.

21901022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21901022 is a deficient number, since it is larger than the sum of its proper divisors (17259778).

21901022 is a wasteful number, since it uses less digits than its factorization.

21901022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 21901022 is about 4679.8527754621. The cubic root of 21901022 is about 279.7830888087.

Adding to 21901022 its reverse (22010912), we get a palindrome (43911934).

The spelling of 21901022 in words is "twenty-one million, nine hundred one thousand, twenty-two".