1212054217 has 12 divisors (see below), whose sum is σ = 1378201860. Its totient is φ = 1063868960.

The previous prime is 1212054211. The next prime is 1212054227. The reversal of 1212054217 is 7124502121.

It can be written as a sum of positive squares in 2 ways, for example, as 306285001 + 905769216 = 17501^2 + 30096^2 .

It is not a de Polignac number, because 1212054217 - 2¹⁹ = 1211529929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212054191 and 1212054200.

It is not an unprimeable number, because it can be changed into a prime (1212054211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 169198 + ... + 176215.

It is an arithmetic number, because the mean of its divisors is an integer number (114850155).

Almost surely, 2^1212054217 is an apocalyptic number.

It is an amenable number.

1212054217 is a deficient number, since it is larger than the sum of its proper divisors (166147643).

1212054217 is a wasteful number, since it uses less digits than its factorization.

1212054217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345464 (or 345453 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 1212054217 is about 34814.5690336675. The cubic root of 1212054217 is about 1066.2049201424.

Adding to 1212054217 its reverse (7124502121), we get a palindrome (8336556338).

The spelling of 1212054217 in words is "one billion, two hundred twelve million, fifty-four thousand, two hundred seventeen".