210412421 has 2 divisors, whose sum is σ = 210412422. Its totient is φ = 210412420.

The previous prime is 210412393. The next prime is 210412439. The reversal of 210412421 is 124214012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149181796 + 61230625 = 12214^2 + 7825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210412421 is a prime.

It is a super-2 number, since 2×210412421² = 88546773822162482, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210412421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210412021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105206210 + 105206211.

It is an arithmetic number, because the mean of its divisors is an integer number (105206211).

Almost surely, 2^210412421 is an apocalyptic number.

It is an amenable number.

210412421 is a deficient number, since it is larger than the sum of its proper divisors (1).

210412421 is an equidigital number, since it uses as much as digits as its factorization.

210412421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 210412421 is about 14505.5996428965. The cubic root of 210412421 is about 594.7810516588.

Adding to 210412421 its reverse (124214012), we get a palindrome (334626433).

The spelling of 210412421 in words is "two hundred ten million, four hundred twelve thousand, four hundred twenty-one".