2121213461 has 2 divisors, whose sum is σ = 2121213462. Its totient is φ = 2121213460.

The previous prime is 2121213431. The next prime is 2121213473. The reversal of 2121213461 is 1643121212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2022210961 + 99002500 = 44969^2 + 9950^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121213461 - 2⁶ = 2121213397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121213431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060606730 + 1060606731.

It is an arithmetic number, because the mean of its divisors is an integer number (1060606731).

Almost surely, 2^2121213461 is an apocalyptic number.

It is an amenable number.

2121213461 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121213461 is an equidigital number, since it uses as much as digits as its factorization.

2121213461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 23.

The square root of 2121213461 is about 46056.6331921907. The cubic root of 2121213461 is about 1284.8767132295.

Adding to 2121213461 its reverse (1643121212), we get a palindrome (3764334673).

The spelling of 2121213461 in words is "two billion, one hundred twenty-one million, two hundred thirteen thousand, four hundred sixty-one".