213455610421 has 2 divisors, whose sum is σ = 213455610422. Its totient is φ = 213455610420.

The previous prime is 213455610383. The next prime is 213455610427. The reversal of 213455610421 is 124016554312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205267894225 + 8187716196 = 453065^2 + 90486^2 .

It is a cyclic number.

It is not a de Polignac number, because 213455610421 - 2⁹ = 213455609909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213455610427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106727805210 + 106727805211.

It is an arithmetic number, because the mean of its divisors is an integer number (106727805211).

Almost surely, 2^213455610421 is an apocalyptic number.

It is an amenable number.

213455610421 is a deficient number, since it is larger than the sum of its proper divisors (1).

213455610421 is an equidigital number, since it uses as much as digits as its factorization.

213455610421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 34.

The spelling of 213455610421 in words is "two hundred thirteen billion, four hundred fifty-five million, six hundred ten thousand, four hundred twenty-one".