21940115 has 8 divisors (see below), whose sum is σ = 27876960. Its totient is φ = 16519552.

The previous prime is 21940111. The next prime is 21940151. The reversal of 21940115 is 51104912.

It is a happy number.

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 21940115 - 2² = 21940111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21940111) 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, 128975 + ... + 129144.

It is an arithmetic number, because the mean of its divisors is an integer number (3484620).

Almost surely, 2^21940115 is an apocalyptic number.

21940115 is a deficient number, since it is larger than the sum of its proper divisors (5936845).

21940115 is a wasteful number, since it uses less digits than its factorization.

21940115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258141.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 21940115 is about 4684.0276472284. The cubic root of 21940115 is about 279.9494594153.

The spelling of 21940115 in words is "twenty-one million, nine hundred forty thousand, one hundred fifteen".