210001012421 has 2 divisors, whose sum is σ = 210001012422. Its totient is φ = 210001012420.

The previous prime is 210001012379. The next prime is 210001012477. The reversal of 210001012421 is 124210100012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182317044196 + 27683968225 = 426986^2 + 166385^2 .

It is a cyclic number.

It is not a de Polignac number, because 210001012421 - 2¹⁰ = 210001011397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210001012396 and 210001012405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210001012721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105000506210 + 105000506211.

It is an arithmetic number, because the mean of its divisors is an integer number (105000506211).

Almost surely, 2^210001012421 is an apocalyptic number.

It is an amenable number.

210001012421 is a deficient number, since it is larger than the sum of its proper divisors (1).

210001012421 is an equidigital number, since it uses as much as digits as its factorization.

210001012421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 210001012421 its reverse (124210100012), we get a palindrome (334211112433).

The spelling of 210001012421 in words is "two hundred ten billion, one million, twelve thousand, four hundred twenty-one".