21054597 has 4 divisors (see below), whose sum is σ = 28072800. Its totient is φ = 14036396.

The previous prime is 21054569. The next prime is 21054601. The reversal of 21054597 is 79545012.

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 21054597 - 2⁶ = 21054533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054697) 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, 3509097 + ... + 3509102.

It is an arithmetic number, because the mean of its divisors is an integer number (7018200).

Almost surely, 2^21054597 is an apocalyptic number.

It is an amenable number.

21054597 is a deficient number, since it is larger than the sum of its proper divisors (7018203).

21054597 is an equidigital number, since it uses as much as digits as its factorization.

21054597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7018202.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 21054597 is about 4588.5288492065. The cubic root of 21054597 is about 276.1313043580.

The spelling of 21054597 in words is "twenty-one million, fifty-four thousand, five hundred ninety-seven".