21935461 has 4 divisors (see below), whose sum is σ = 22445632. Its totient is φ = 21425292.

The previous prime is 21935429. The next prime is 21935467. The reversal of 21935461 is 16453912.

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 21935461 - 2⁵ = 21935429 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 (21935467) 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, 255021 + ... + 255106.

It is an arithmetic number, because the mean of its divisors is an integer number (5611408).

Almost surely, 2^21935461 is an apocalyptic number.

It is an amenable number.

21935461 is a deficient number, since it is larger than the sum of its proper divisors (510171).

21935461 is an equidigital number, since it uses as much as digits as its factorization.

21935461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510170.

The product of its digits is 6480, while the sum is 31.

The square root of 21935461 is about 4683.5308262037. The cubic root of 21935461 is about 279.9296634553.

The spelling of 21935461 in words is "twenty-one million, nine hundred thirty-five thousand, four hundred sixty-one".