2121335424421 has 2 divisors, whose sum is σ = 2121335424422. Its totient is φ = 2121335424420.

The previous prime is 2121335424331. The next prime is 2121335424431. The reversal of 2121335424421 is 1244245331212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1994393572900 + 126941851521 = 1412230^2 + 356289^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121335424421 - 2²⁹ = 2120798553509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121335424431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060667712210 + 1060667712211.

It is an arithmetic number, because the mean of its divisors is an integer number (1060667712211).

Almost surely, 2^{2121335424421} is an apocalyptic number.

It is an amenable number.

2121335424421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121335424421 is an equidigital number, since it uses as much as digits as its factorization.

2121335424421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 34.

The spelling of 2121335424421 in words is "two trillion, one hundred twenty-one billion, three hundred thirty-five million, four hundred twenty-four thousand, four hundred twenty-one".