221421323029 has 2 divisors, whose sum is σ = 221421323030. Its totient is φ = 221421323028.

The previous prime is 221421322987. The next prime is 221421323047. The reversal of 221421323029 is 920323124122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176689919025 + 44731404004 = 420345^2 + 211498^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221421323029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221421324029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110710661514 + 110710661515.

It is an arithmetic number, because the mean of its divisors is an integer number (110710661515).

Almost surely, 2^221421323029 is an apocalyptic number.

It is an amenable number.

221421323029 is a deficient number, since it is larger than the sum of its proper divisors (1).

221421323029 is an equidigital number, since it uses as much as digits as its factorization.

221421323029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The spelling of 221421323029 in words is "two hundred twenty-one billion, four hundred twenty-one million, three hundred twenty-three thousand, twenty-nine".