210151421 has 2 divisors, whose sum is σ = 210151422. Its totient is φ = 210151420.

The previous prime is 210151369. The next prime is 210151441. The reversal of 210151421 is 124151012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146071396 + 64080025 = 12086^2 + 8005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210151421 is a prime.

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 210151421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210151441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105075710 + 105075711.

It is an arithmetic number, because the mean of its divisors is an integer number (105075711).

Almost surely, 2^210151421 is an apocalyptic number.

It is an amenable number.

210151421 is a deficient number, since it is larger than the sum of its proper divisors (1).

210151421 is an equidigital number, since it uses as much as digits as its factorization.

210151421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 210151421 is about 14496.6003255936. The cubic root of 210151421 is about 594.5350235888.

The spelling of 210151421 in words is "two hundred ten million, one hundred fifty-one thousand, four hundred twenty-one".