210203220421 has 2 divisors, whose sum is σ = 210203220422. Its totient is φ = 210203220420.

The previous prime is 210203220407. The next prime is 210203220427. The reversal of 210203220421 is 124022302012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128572444900 + 81630775521 = 358570^2 + 285711^2 .

It is a cyclic number.

It is not a de Polignac number, because 210203220421 - 2⁹ = 210203219909 is a prime.

It is a super-2 number, since 2×210203220421² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210203220427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105101610210 + 105101610211.

It is an arithmetic number, because the mean of its divisors is an integer number (105101610211).

Almost surely, 2^210203220421 is an apocalyptic number.

It is an amenable number.

210203220421 is a deficient number, since it is larger than the sum of its proper divisors (1).

210203220421 is an equidigital number, since it uses as much as digits as its factorization.

210203220421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 210203220421 its reverse (124022302012), we get a palindrome (334225522433).

The spelling of 210203220421 in words is "two hundred ten billion, two hundred three million, two hundred twenty thousand, four hundred twenty-one".