1221201019 has 2 divisors, whose sum is σ = 1221201020. Its totient is φ = 1221201018.

The previous prime is 1221200993. The next prime is 1221201083. The reversal of 1221201019 is 9101021221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221201019 - 2⁷ = 1221200891 is a prime.

It is a super-2 number, since 2×1221201019² = 2982663857613276722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221200987 and 1221201005.

It is not a weakly prime, because it can be changed into another prime (1221201119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610600509 + 610600510.

It is an arithmetic number, because the mean of its divisors is an integer number (610600510).

Almost surely, 2^1221201019 is an apocalyptic number.

1221201019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221201019 is an equidigital number, since it uses as much as digits as its factorization.

1221201019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 1221201019 is about 34945.6867009364. The cubic root of 1221201019 is about 1068.8802502633.

The spelling of 1221201019 in words is "one billion, two hundred twenty-one million, two hundred one thousand, nineteen".