21714577 has 4 divisors (see below), whose sum is σ = 22124340. Its totient is φ = 21304816.

The previous prime is 21714571. The next prime is 21714607. The reversal of 21714577 is 77541712.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12222016 + 9492561 = 3496^2 + 3081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21714577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21714571) 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, 204802 + ... + 204907.

It is an arithmetic number, because the mean of its divisors is an integer number (5531085).

Almost surely, 2^21714577 is an apocalyptic number.

It is an amenable number.

21714577 is a deficient number, since it is larger than the sum of its proper divisors (409763).

21714577 is an equidigital number, since it uses as much as digits as its factorization.

21714577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409762.

The product of its digits is 13720, while the sum is 34.

The square root of 21714577 is about 4659.8902347588. The cubic root of 21714577 is about 278.9868871849.

The spelling of 21714577 in words is "twenty-one million, seven hundred fourteen thousand, five hundred seventy-seven".