21514918 has 8 divisors (see below), whose sum is σ = 32574312. Its totient is φ = 10656816.

The previous prime is 21514903. The next prime is 21514931. The reversal of 21514918 is 81941512.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21514918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50055 + ... + 50482.

It is an arithmetic number, because the mean of its divisors is an integer number (4071789).

Almost surely, 2^21514918 is an apocalyptic number.

21514918 is a deficient number, since it is larger than the sum of its proper divisors (11059394).

21514918 is a wasteful number, since it uses less digits than its factorization.

21514918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100646.

The product of its digits is 2880, while the sum is 31.

The square root of 21514918 is about 4638.4176181107. The cubic root of 21514918 is about 278.1291862014.

The spelling of 21514918 in words is "twenty-one million, five hundred fourteen thousand, nine hundred eighteen".