21612230407429 has 2 divisors, whose sum is σ = 21612230407430. Its totient is φ = 21612230407428.

The previous prime is 21612230407409. The next prime is 21612230407441. The reversal of 21612230407429 is 92470403221612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11981449184929 + 9630781222500 = 3461423^2 + 3103350^2 .

It is a cyclic number.

It is not a de Polignac number, because 21612230407429 - 2⁹ = 21612230406917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21612230407409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10806115203714 + 10806115203715.

It is an arithmetic number, because the mean of its divisors is an integer number (10806115203715).

Almost surely, 2^{21612230407429} is an apocalyptic number.

It is an amenable number.

21612230407429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21612230407429 is an equidigital number, since it uses as much as digits as its factorization.

21612230407429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 43.

The spelling of 21612230407429 in words is "twenty-one trillion, six hundred twelve billion, two hundred thirty million, four hundred seven thousand, four hundred twenty-nine".