20021201001929 has 2 divisors, whose sum is σ = 20021201001930. Its totient is φ = 20021201001928.

The previous prime is 20021201001859. The next prime is 20021201001943. The reversal of 20021201001929 is 92910010212002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19659336193225 + 361864808704 = 4433885^2 + 601552^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021201001929 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021201001979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010600500964 + 10010600500965.

It is an arithmetic number, because the mean of its divisors is an integer number (10010600500965).

Almost surely, 2^{20021201001929} is an apocalyptic number.

It is an amenable number.

20021201001929 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021201001929 is an equidigital number, since it uses as much as digits as its factorization.

20021201001929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 20021201001929 in words is "twenty trillion, twenty-one billion, two hundred one million, one thousand, nine hundred twenty-nine".