20335129621 has 2 divisors, whose sum is σ = 20335129622. Its totient is φ = 20335129620.

The previous prime is 20335129597. The next prime is 20335129627. The reversal of 20335129621 is 12692153302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19698122500 + 637007121 = 140350^2 + 25239^2 .

It is a cyclic number.

It is not a de Polignac number, because 20335129621 - 2⁹ = 20335129109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20335129627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10167564810 + 10167564811.

It is an arithmetic number, because the mean of its divisors is an integer number (10167564811).

Almost surely, 2^20335129621 is an apocalyptic number.

It is an amenable number.

20335129621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20335129621 is an equidigital number, since it uses as much as digits as its factorization.

20335129621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The spelling of 20335129621 in words is "twenty billion, three hundred thirty-five million, one hundred twenty-nine thousand, six hundred twenty-one".