21424701 has 4 divisors (see below), whose sum is σ = 28566272. Its totient is φ = 14283132.

The previous prime is 21424699. The next prime is 21424759. The reversal of 21424701 is 10742412.

It is a happy number.

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 21424701 - 2¹ = 21424699 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21426701) 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, 3570781 + ... + 3570786.

It is an arithmetic number, because the mean of its divisors is an integer number (7141568).

Almost surely, 2^21424701 is an apocalyptic number.

It is an amenable number.

21424701 is a deficient number, since it is larger than the sum of its proper divisors (7141571).

21424701 is an equidigital number, since it uses as much as digits as its factorization.

21424701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7141570.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 21424701 is about 4628.6824259178. The cubic root of 21424701 is about 277.7398883372.

The spelling of 21424701 in words is "twenty-one million, four hundred twenty-four thousand, seven hundred one".