621221147 has 2 divisors, whose sum is σ = 621221148. Its totient is φ = 621221146.

The previous prime is 621221101. The next prime is 621221149. The reversal of 621221147 is 741122126.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 621221147 - 2⁸ = 621220891 is a prime.

It is a super-3 number, since 3×621221147³ (a number of 27 digits) contains 333 as substring.

Together with 621221149, 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 (621221149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310610573 + 310610574.

It is an arithmetic number, because the mean of its divisors is an integer number (310610574).

Almost surely, 2^621221147 is an apocalyptic number.

621221147 is a deficient number, since it is larger than the sum of its proper divisors (1).

621221147 is an equidigital number, since it uses as much as digits as its factorization.

621221147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 26.

The square root of 621221147 is about 24924.3083554991. The cubic root of 621221147 is about 853.2613561150.

The spelling of 621221147 in words is "six hundred twenty-one million, two hundred twenty-one thousand, one hundred forty-seven".