21223201 has 4 divisors (see below), whose sum is σ = 21363904. Its totient is φ = 21082500.

The previous prime is 21223193. The next prime is 21223219. The reversal of 21223201 is 10232212.

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 21223201 - 2³ = 21223193 is a prime.

It is a super-3 number, since 3×21223201³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21223261) 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, 70125 + ... + 70426.

It is an arithmetic number, because the mean of its divisors is an integer number (5340976).

Almost surely, 2^21223201 is an apocalyptic number.

It is an amenable number.

21223201 is a deficient number, since it is larger than the sum of its proper divisors (140703).

21223201 is a wasteful number, since it uses less digits than its factorization.

21223201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140702.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21223201 is about 4606.8645519485. The cubic root of 21223201 is about 276.8664267567.

Adding to 21223201 its reverse (10232212), we get a palindrome (31455413).

The spelling of 21223201 in words is "twenty-one million, two hundred twenty-three thousand, two hundred one".