21941699 has 4 divisors (see below), whose sum is σ = 23629536. Its totient is φ = 20253864.

The previous prime is 21941681. The next prime is 21941737. The reversal of 21941699 is 99614912.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21941699 - 2⁸ = 21941443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21941669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 843899 + ... + 843924.

It is an arithmetic number, because the mean of its divisors is an integer number (5907384).

Almost surely, 2^21941699 is an apocalyptic number.

21941699 is a deficient number, since it is larger than the sum of its proper divisors (1687837).

21941699 is a wasteful number, since it uses less digits than its factorization.

21941699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687836.

The product of its digits is 34992, while the sum is 41.

The square root of 21941699 is about 4684.1967294297. The cubic root of 21941699 is about 279.9561963789.

The spelling of 21941699 in words is "twenty-one million, nine hundred forty-one thousand, six hundred ninety-nine".