21960597 has 4 divisors (see below), whose sum is σ = 29280800. Its totient is φ = 14640396.

The previous prime is 21960593. The next prime is 21960611. The reversal of 21960597 is 79506912.

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 not a de Polignac number, because 21960597 - 2² = 21960593 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21960593) 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, 3660097 + ... + 3660102.

It is an arithmetic number, because the mean of its divisors is an integer number (7320200).

Almost surely, 2^21960597 is an apocalyptic number.

It is an amenable number.

21960597 is a deficient number, since it is larger than the sum of its proper divisors (7320203).

21960597 is an equidigital number, since it uses as much as digits as its factorization.

21960597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7320202.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 21960597 is about 4686.2135034588. The cubic root of 21960597 is about 280.0365471002.

The spelling of 21960597 in words is "twenty-one million, nine hundred sixty thousand, five hundred ninety-seven".