221472461 has 4 divisors (see below), whose sum is σ = 253111392. Its totient is φ = 189833532.

The previous prime is 221472443. The next prime is 221472467. The reversal of 221472461 is 164274122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 164274122 = 2 ⋅82137061.

It is not a de Polignac number, because 221472461 - 2⁶ = 221472397 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 (221472467) 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, 15819455 + ... + 15819468.

It is an arithmetic number, because the mean of its divisors is an integer number (63277848).

Almost surely, 2^221472461 is an apocalyptic number.

It is an amenable number.

221472461 is a deficient number, since it is larger than the sum of its proper divisors (31638931).

221472461 is an equidigital number, since it uses as much as digits as its factorization.

221472461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31638930.

The product of its digits is 5376, while the sum is 29.

The square root of 221472461 is about 14881.9508465792. The cubic root of 221472461 is about 605.0248934501.

The spelling of 221472461 in words is "two hundred twenty-one million, four hundred seventy-two thousand, four hundred sixty-one".