221161692 has 12 divisors (see below), whose sum is σ = 516043976. Its totient is φ = 73720560.

The previous prime is 221161651. The next prime is 221161693. The reversal of 221161692 is 296161122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221161693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9215059 + ... + 9215082.

Almost surely, 2^221161692 is an apocalyptic number.

It is an amenable number.

221161692 is an abundant number, since it is smaller than the sum of its proper divisors (294882284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221161692 is a wasteful number, since it uses less digits than its factorization.

221161692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18430148 (or 18430146 counting only the distinct ones).

The product of its digits is 2592, while the sum is 30.

The square root of 221161692 is about 14871.5060434376. The cubic root of 221161692 is about 604.7417717275.

It can be divided in two parts, 2211 and 61692, that added together give a triangular number (63903 = T₃₅₇).

The spelling of 221161692 in words is "two hundred twenty-one million, one hundred sixty-one thousand, six hundred ninety-two".