21622001 has 4 divisors (see below), whose sum is σ = 22562112. Its totient is φ = 20681892.

The previous prime is 21621997. The next prime is 21622033. The reversal of 21622001 is 10022612.

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 21622001 - 2² = 21621997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21622061) 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, 470021 + ... + 470066.

It is an arithmetic number, because the mean of its divisors is an integer number (5640528).

Almost surely, 2^21622001 is an apocalyptic number.

It is an amenable number.

21622001 is a deficient number, since it is larger than the sum of its proper divisors (940111).

21622001 is an equidigital number, since it uses as much as digits as its factorization.

21622001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940110.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21622001 is about 4649.9463437765. The cubic root of 21622001 is about 278.5898531128.

Adding to 21622001 its reverse (10022612), we get a palindrome (31644613).

The spelling of 21622001 in words is "twenty-one million, six hundred twenty-two thousand, one".