21520614 has 32 divisors (see below), whose sum is σ = 44029440. Its totient is φ = 7011072.

The previous prime is 21520607. The next prime is 21520637. The reversal of 21520614 is 41602512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59767 + ... + 60125.

It is an arithmetic number, because the mean of its divisors is an integer number (1375920).

Almost surely, 2^21520614 is an apocalyptic number.

21520614 is an abundant number, since it is smaller than the sum of its proper divisors (22508826).

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

21520614 is a wasteful number, since it uses less digits than its factorization.

21520614 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21520614 is about 4639.0315799744. The cubic root of 21520614 is about 278.1537286151.

The spelling of 21520614 in words is "twenty-one million, five hundred twenty thousand, six hundred fourteen".