21965007 has 8 divisors (see below), whose sum is σ = 30828160. Its totient is φ = 13872600.

The previous prime is 21964979. The next prime is 21965017. The reversal of 21965007 is 70056912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21965007 - 2¹⁹ = 21440719 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 (21965017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192619 + ... + 192732.

It is an arithmetic number, because the mean of its divisors is an integer number (3853520).

Almost surely, 2^21965007 is an apocalyptic number.

21965007 is a deficient number, since it is larger than the sum of its proper divisors (8863153).

21965007 is a wasteful number, since it uses less digits than its factorization.

21965007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385373.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 21965007 is about 4686.6840089769. The cubic root of 21965007 is about 280.0552909519.

The spelling of 21965007 in words is "twenty-one million, nine hundred sixty-five thousand, seven".