213154421 has 2 divisors, whose sum is σ = 213154422. Its totient is φ = 213154420.

The previous prime is 213154351. The next prime is 213154427. The reversal of 213154421 is 124451312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196840900 + 16313521 = 14030^2 + 4039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213154421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213154427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106577210 + 106577211.

It is an arithmetic number, because the mean of its divisors is an integer number (106577211).

Almost surely, 2^213154421 is an apocalyptic number.

It is an amenable number.

213154421 is a deficient number, since it is larger than the sum of its proper divisors (1).

213154421 is an equidigital number, since it uses as much as digits as its factorization.

213154421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 23.

The square root of 213154421 is about 14599.8089371060. The cubic root of 213154421 is about 597.3535489531.

The spelling of 213154421 in words is "two hundred thirteen million, one hundred fifty-four thousand, four hundred twenty-one".