221400029 has 2 divisors, whose sum is σ = 221400030. Its totient is φ = 221400028.

The previous prime is 221400017. The next prime is 221400031. The reversal of 221400029 is 920004122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144048004 + 77352025 = 12002^2 + 8795^2 .

It is a cyclic number.

It is not a de Polignac number, because 221400029 - 2¹⁶ = 221334493 is a prime.

Together with 221400031, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221400059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110700014 + 110700015.

It is an arithmetic number, because the mean of its divisors is an integer number (110700015).

Almost surely, 2^221400029 is an apocalyptic number.

It is an amenable number.

221400029 is a deficient number, since it is larger than the sum of its proper divisors (1).

221400029 is an equidigital number, since it uses as much as digits as its factorization.

221400029 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 20.

The square root of 221400029 is about 14879.5170956587. The cubic root of 221400029 is about 604.9589289789.

The spelling of 221400029 in words is "two hundred twenty-one million, four hundred thousand, twenty-nine".