1200421213 has 2 divisors, whose sum is σ = 1200421214. Its totient is φ = 1200421212.

The previous prime is 1200421171. The next prime is 1200421249. The reversal of 1200421213 is 3121240021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1174227289 + 26193924 = 34267^2 + 5118^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200421213 - 2⁹ = 1200420701 is a prime.

It is a super-2 number, since 2×1200421213² = 2882022177240782738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200421253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600210606 + 600210607.

It is an arithmetic number, because the mean of its divisors is an integer number (600210607).

Almost surely, 2^1200421213 is an apocalyptic number.

It is an amenable number.

1200421213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200421213 is an equidigital number, since it uses as much as digits as its factorization.

1200421213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1200421213 is about 34647.0953039357. The cubic root of 1200421213 is about 1062.7828895278.

Adding to 1200421213 its reverse (3121240021), we get a palindrome (4321661234).

The spelling of 1200421213 in words is "one billion, two hundred million, four hundred twenty-one thousand, two hundred thirteen".