21623701 has 8 divisors (see below), whose sum is σ = 23649408. Its totient is φ = 19608000.

The previous prime is 21623699. The next prime is 21623731. The reversal of 21623701 is 10732612.

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

It is a cyclic number.

It is not a de Polignac number, because 21623701 - 2¹ = 21623699 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 (21623731) 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, 2461 + ... + 7021.

It is an arithmetic number, because the mean of its divisors is an integer number (2956176).

Almost surely, 2^21623701 is an apocalyptic number.

It is an amenable number.

21623701 is a deficient number, since it is larger than the sum of its proper divisors (2025707).

21623701 is a wasteful number, since it uses less digits than its factorization.

21623701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5003.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 21623701 is about 4650.1291379918. The cubic root of 21623701 is about 278.5971541691.

The spelling of 21623701 in words is "twenty-one million, six hundred twenty-three thousand, seven hundred one".