21514553 has 4 divisors (see below), whose sum is σ = 21529728. Its totient is φ = 21499380.

The previous prime is 21514543. The next prime is 21514609. The reversal of 21514553 is 35541512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21514553 - 2²² = 17320249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21514543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5213 + ... + 8378.

It is an arithmetic number, because the mean of its divisors is an integer number (5382432).

Almost surely, 2^21514553 is an apocalyptic number.

It is an amenable number.

21514553 is a deficient number, since it is larger than the sum of its proper divisors (15175).

21514553 is a wasteful number, since it uses less digits than its factorization.

21514553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15174.

The product of its digits is 3000, while the sum is 26.

The square root of 21514553 is about 4638.3782726293. The cubic root of 21514553 is about 278.1276133744.

The spelling of 21514553 in words is "twenty-one million, five hundred fourteen thousand, five hundred fifty-three".