221434000621 has 2 divisors, whose sum is σ = 221434000622. Its totient is φ = 221434000620.

The previous prime is 221434000591. The next prime is 221434000639. The reversal of 221434000621 is 126000434122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201556102500 + 19877898121 = 448950^2 + 140989^2 .

It is a cyclic number.

It is not a de Polignac number, because 221434000621 - 2⁷ = 221434000493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221434000651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110717000310 + 110717000311.

It is an arithmetic number, because the mean of its divisors is an integer number (110717000311).

Almost surely, 2^221434000621 is an apocalyptic number.

It is an amenable number.

221434000621 is a deficient number, since it is larger than the sum of its proper divisors (1).

221434000621 is an equidigital number, since it uses as much as digits as its factorization.

221434000621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 221434000621 its reverse (126000434122), we get a palindrome (347434434743).

The spelling of 221434000621 in words is "two hundred twenty-one billion, four hundred thirty-four million, six hundred twenty-one", and thus it is an aban number.