221131492 has 6 divisors (see below), whose sum is σ = 386980118. Its totient is φ = 110565744.

The previous prime is 221131489. The next prime is 221131523. The reversal of 221131492 is 294131122.

221131492 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 191711716 + 29419776 = 13846^2 + 5424^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27641433 + ... + 27641440.

Almost surely, 2^221131492 is an apocalyptic number.

It is an amenable number.

221131492 is a deficient number, since it is larger than the sum of its proper divisors (165848626).

221131492 is a wasteful number, since it uses less digits than its factorization.

221131492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55282877 (or 55282875 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 221131492 is about 14870.4906442256. The cubic root of 221131492 is about 604.7142443067.

The spelling of 221131492 in words is "two hundred twenty-one million, one hundred thirty-one thousand, four hundred ninety-two".