621223201 has 2 divisors, whose sum is σ = 621223202. Its totient is φ = 621223200.

The previous prime is 621223199. The next prime is 621223237. The reversal of 621223201 is 102322126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 547606801 + 73616400 = 23401^2 + 8580^2 .

It is a cyclic number.

It is not a de Polignac number, because 621223201 - 2¹ = 621223199 is a prime.

Together with 621223199, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (621223241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310611600 + 310611601.

It is an arithmetic number, because the mean of its divisors is an integer number (310611601).

Almost surely, 2^621223201 is an apocalyptic number.

It is an amenable number.

621223201 is a deficient number, since it is larger than the sum of its proper divisors (1).

621223201 is an equidigital number, since it uses as much as digits as its factorization.

621223201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 621223201 is about 24924.3495602192. The cubic root of 621223201 is about 853.2622965192.

Adding to 621223201 its reverse (102322126), we get a palindrome (723545327).

The spelling of 621223201 in words is "six hundred twenty-one million, two hundred twenty-three thousand, two hundred one".