21022201 has 4 divisors (see below), whose sum is σ = 21110400. Its totient is φ = 20934004.

The previous prime is 21022193. The next prime is 21022213. The reversal of 21022201 is 10222012.

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 21022201 - 2³ = 21022193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022271) 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, 43741 + ... + 44218.

It is an arithmetic number, because the mean of its divisors is an integer number (5277600).

Almost surely, 2^21022201 is an apocalyptic number.

It is an amenable number.

21022201 is a deficient number, since it is larger than the sum of its proper divisors (88199).

21022201 is an equidigital number, since it uses as much as digits as its factorization.

21022201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88198.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21022201 is about 4584.9973827692. The cubic root of 21022201 is about 275.9896070091.

Adding to 21022201 its reverse (10222012), we get a palindrome (31244213).

It can be divided in two parts, 2 and 1022201, that multiplied together give a palindrome (2044402).

The spelling of 21022201 in words is "twenty-one million, twenty-two thousand, two hundred one".