221401229 has 16 divisors (see below), whose sum is σ = 260547456. Its totient is φ = 184161600.

The previous prime is 221401199. The next prime is 221401261. The reversal of 221401229 is 922104122.

It is not a de Polignac number, because 221401229 - 2²⁰ = 220352653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221400229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126299 + ... + 128039.

It is an arithmetic number, because the mean of its divisors is an integer number (16284216).

Almost surely, 2^221401229 is an apocalyptic number.

It is an amenable number.

221401229 is a deficient number, since it is larger than the sum of its proper divisors (39146227).

221401229 is a wasteful number, since it uses less digits than its factorization.

221401229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2276.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 221401229 is about 14879.5574194934. The cubic root of 221401229 is about 604.9600219468.

The spelling of 221401229 in words is "two hundred twenty-one million, four hundred one thousand, two hundred twenty-nine".