21139914 has 16 divisors (see below), whose sum is σ = 42419520. Its totient is φ = 7023360.

The previous prime is 21139901. The next prime is 21139919. The reversal of 21139914 is 41993112.

It is not an unprimeable number, because it can be changed into a prime (21139919) 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, 3799 + ... + 7530.

It is an arithmetic number, because the mean of its divisors is an integer number (2651220).

Almost surely, 2^21139914 is an apocalyptic number.

21139914 is an abundant number, since it is smaller than the sum of its proper divisors (21279606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21139914 is a wasteful number, since it uses less digits than its factorization.

21139914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11645.

The product of its digits is 1944, while the sum is 30.

The square root of 21139914 is about 4597.8162207726. The cubic root of 21139914 is about 276.5037795406.

The spelling of 21139914 in words is "twenty-one million, one hundred thirty-nine thousand, nine hundred fourteen".