21990122 has 24 divisors (see below), whose sum is σ = 41860800. Its totient is φ = 8567160.

The previous prime is 21990113. The next prime is 21990131. The reversal of 21990122 is 22109912.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21990113) and next prime (21990131).

It is a junction number, because it is equal to n+sod(n) for n = 21990091 and 21990100.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9122 + ... + 11277.

It is an arithmetic number, because the mean of its divisors is an integer number (1744200).

Almost surely, 2^21990122 is an apocalyptic number.

21990122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21990122 is a deficient number, since it is larger than the sum of its proper divisors (19870678).

21990122 is a wasteful number, since it uses less digits than its factorization.

21990122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20426 (or 20419 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 21990122 is about 4689.3626432597. The cubic root of 21990122 is about 280.1619895987.

The spelling of 21990122 in words is "twenty-one million, nine hundred ninety thousand, one hundred twenty-two".