21514718 has 4 divisors (see below), whose sum is σ = 32272080. Its totient is φ = 10757358.

The previous prime is 21514687. The next prime is 21514721. The reversal of 21514718 is 81741512.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5378678 + ... + 5378681.

It is an arithmetic number, because the mean of its divisors is an integer number (8068020).

Almost surely, 2^21514718 is an apocalyptic number.

21514718 is a deficient number, since it is larger than the sum of its proper divisors (10757362).

21514718 is a wasteful number, since it uses less digits than its factorization.

21514718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10757361.

The product of its digits is 2240, while the sum is 29.

The square root of 21514718 is about 4638.3960589842. The cubic root of 21514718 is about 278.1283243806.

The spelling of 21514718 in words is "twenty-one million, five hundred fourteen thousand, seven hundred eighteen".