1221432167 has 8 divisors (see below), whose sum is σ = 1295092800. Its totient is φ = 1147972864.

The previous prime is 1221432139. The next prime is 1221432169. The reversal of 1221432167 is 7612341221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221432167 - 2²² = 1217237863 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 (1221432169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37742 + ... + 62187.

It is an arithmetic number, because the mean of its divisors is an integer number (161886600).

Almost surely, 2^1221432167 is an apocalyptic number.

1221432167 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1221432167 is a deficient number, since it is larger than the sum of its proper divisors (73660633).

1221432167 is an equidigital number, since it uses as much as digits as its factorization.

1221432167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100665.

The product of its digits is 4032, while the sum is 29.

The square root of 1221432167 is about 34948.9937909520. The cubic root of 1221432167 is about 1068.9476849557.

Adding to 1221432167 its reverse (7612341221), we get a palindrome (8833773388).

The spelling of 1221432167 in words is "one billion, two hundred twenty-one million, four hundred thirty-two thousand, one hundred sixty-seven".