221430029 has 2 divisors, whose sum is σ = 221430030. Its totient is φ = 221430028.

The previous prime is 221430023. The next prime is 221430037. The reversal of 221430029 is 920034122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218980804 + 2449225 = 14798^2 + 1565^2 .

It is a cyclic number.

It is not a de Polignac number, because 221430029 - 2²⁴ = 204652813 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 221429986 and 221430013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221430023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110715014 + 110715015.

It is an arithmetic number, because the mean of its divisors is an integer number (110715015).

Almost surely, 2^221430029 is an apocalyptic number.

It is an amenable number.

221430029 is a deficient number, since it is larger than the sum of its proper divisors (1).

221430029 is an equidigital number, since it uses as much as digits as its factorization.

221430029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 221430029 is about 14880.5251587436. The cubic root of 221430029 is about 604.9862519928.

The spelling of 221430029 in words is "two hundred twenty-one million, four hundred thirty thousand, twenty-nine".