21990411 has 12 divisors (see below), whose sum is σ = 31836480. Its totient is φ = 14626800.

The previous prime is 21990373. The next prime is 21990413. The reversal of 21990411 is 11409912.

It is not a de Polignac number, because 21990411 - 2⁶ = 21990347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21990413) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1761 + ... + 6861.

It is an arithmetic number, because the mean of its divisors is an integer number (2653040).

Almost surely, 2^21990411 is an apocalyptic number.

21990411 is a deficient number, since it is larger than the sum of its proper divisors (9846069).

21990411 is a wasteful number, since it uses less digits than its factorization.

21990411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5586 (or 5583 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 21990411 is about 4689.3934575806. The cubic root of 21990411 is about 280.1632169143.

The spelling of 21990411 in words is "twenty-one million, nine hundred ninety thousand, four hundred eleven".