210121321429 has 2 divisors, whose sum is σ = 210121321430. Its totient is φ = 210121321428.

The previous prime is 210121321381. The next prime is 210121321463. The reversal of 210121321429 is 924123121012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175056886404 + 35064435025 = 418398^2 + 187255^2 .

It is a cyclic number.

It is not a de Polignac number, because 210121321429 - 2⁷ = 210121321301 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210121321397 and 210121321406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210121322429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060660714 + 105060660715.

It is an arithmetic number, because the mean of its divisors is an integer number (105060660715).

Almost surely, 2^210121321429 is an apocalyptic number.

It is an amenable number.

210121321429 is a deficient number, since it is larger than the sum of its proper divisors (1).

210121321429 is an equidigital number, since it uses as much as digits as its factorization.

210121321429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 210121321429 in words is "two hundred ten billion, one hundred twenty-one million, three hundred twenty-one thousand, four hundred twenty-nine".