1212467221 has 6 divisors (see below), whose sum is σ = 1410421110. Its totient is φ = 1039257576.

The previous prime is 1212467189. The next prime is 1212467339. The reversal of 1212467221 is 1227642121.

It can be written as a sum of positive squares in only one way, i.e., 970322500 + 242144721 = 31150^2 + 15561^2 .

It is not a de Polignac number, because 1212467221 - 2⁵ = 1212467189 is a prime.

It is the 34821-st Hogben number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212467221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212461221) by changing a digit.

It is a nontrivial repunit in base 34820.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12372066 + ... + 12372163.

It is an arithmetic number, because the mean of its divisors is an integer number (235070185).

Almost surely, 2^1212467221 is an apocalyptic number.

It is an amenable number.

1212467221 is a deficient number, since it is larger than the sum of its proper divisors (197953889).

1212467221 is an equidigital number, since it uses as much as digits as its factorization.

1212467221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24744243 (or 24744236 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 1212467221 is about 34820.5000107695. The cubic root of 1212467221 is about 1066.3260084800.

The spelling of 1212467221 in words is "one billion, two hundred twelve million, four hundred sixty-seven thousand, two hundred twenty-one".