21962249 has 8 divisors (see below), whose sum is σ = 23351328. Its totient is φ = 20584000.

The previous prime is 21962209. The next prime is 21962261. The reversal of 21962249 is 94226912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21962249 - 2⁸ = 21961993 is a prime.

It is a super-2 number, since 2×21962249² = 964680762276002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21962209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1694 + ... + 6840.

It is an arithmetic number, because the mean of its divisors is an integer number (2918916).

Almost surely, 2^21962249 is an apocalyptic number.

It is an amenable number.

21962249 is a deficient number, since it is larger than the sum of its proper divisors (1389079).

21962249 is a wasteful number, since it uses less digits than its factorization.

21962249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5415.

The product of its digits is 15552, while the sum is 35.

The square root of 21962249 is about 4686.3897618529. The cubic root of 21962249 is about 280.0435689005.

The spelling of 21962249 in words is "twenty-one million, nine hundred sixty-two thousand, two hundred forty-nine".