212210400421 has 2 divisors, whose sum is σ = 212210400422. Its totient is φ = 212210400420.

The previous prime is 212210400361. The next prime is 212210400431. The reversal of 212210400421 is 124004012212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211167820900 + 1042579521 = 459530^2 + 32289^2 .

It is a cyclic number.

It is not a de Polignac number, because 212210400421 - 2²⁵ = 212176845989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212210400431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106105200210 + 106105200211.

It is an arithmetic number, because the mean of its divisors is an integer number (106105200211).

Almost surely, 2^212210400421 is an apocalyptic number.

It is an amenable number.

212210400421 is a deficient number, since it is larger than the sum of its proper divisors (1).

212210400421 is an equidigital number, since it uses as much as digits as its factorization.

212210400421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 212210400421 its reverse (124004012212), we get a palindrome (336214412633).

The spelling of 212210400421 in words is "two hundred twelve billion, two hundred ten million, four hundred thousand, four hundred twenty-one".