21649022 has 24 divisors (see below), whose sum is σ = 34345272. Its totient is φ = 10231200.

The previous prime is 21648997. The next prime is 21649031. The reversal of 21649022 is 22094612.

It is a junction number, because it is equal to n+sod(n) for n = 21648982 and 21649000.

It is a congruent number.

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, 102497 + ... + 102707.

It is an arithmetic number, because the mean of its divisors is an integer number (1431053).

Almost surely, 2^21649022 is an apocalyptic number.

21649022 is a deficient number, since it is larger than the sum of its proper divisors (12696250).

21649022 is a wasteful number, since it uses less digits than its factorization.

21649022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 21649022 is about 4652.8509539851. The cubic root of 21649022 is about 278.7058559869.

The spelling of 21649022 in words is "twenty-one million, six hundred forty-nine thousand, twenty-two".