1212419521 has 2 divisors, whose sum is σ = 1212419522. Its totient is φ = 1212419520.

The previous prime is 1212419503. The next prime is 1212419531. The reversal of 1212419521 is 1259142121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 975875121 + 236544400 = 31239^2 + 15380^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212419521 - 2¹⁵ = 1212386753 is a prime.

It is a super-2 number, since 2×1212419521² = 2939922189803738882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1212419521.

It is not a weakly prime, because it can be changed into another prime (1212419531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606209760 + 606209761.

It is an arithmetic number, because the mean of its divisors is an integer number (606209761).

Almost surely, 2^1212419521 is an apocalyptic number.

It is an amenable number.

1212419521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212419521 is an equidigital number, since it uses as much as digits as its factorization.

1212419521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 28.

The square root of 1212419521 is about 34819.8150626910. The cubic root of 1212419521 is about 1066.3120247569.

The spelling of 1212419521 in words is "one billion, two hundred twelve million, four hundred nineteen thousand, five hundred twenty-one".