21949401 has 8 divisors (see below), whose sum is σ = 29702944. Its totient is φ = 14414400.

The previous prime is 21949387. The next prime is 21949409. The reversal of 21949401 is 10494912.

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

It is not a de Polignac number, because 21949401 - 2⁷ = 21949273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21949409) 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, 54400 + ... + 54801.

It is an arithmetic number, because the mean of its divisors is an integer number (3712868).

Almost surely, 2^21949401 is an apocalyptic number.

It is an amenable number.

21949401 is a deficient number, since it is larger than the sum of its proper divisors (7753543).

21949401 is a wasteful number, since it uses less digits than its factorization.

21949401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109271.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 21949401 is about 4685.0187833135. The cubic root of 21949401 is about 279.9889493938.

The spelling of 21949401 in words is "twenty-one million, nine hundred forty-nine thousand, four hundred one".