21222001013929 has 2 divisors, whose sum is σ = 21222001013930. Its totient is φ = 21222001013928.

The previous prime is 21222001013887. The next prime is 21222001013959. The reversal of 21222001013929 is 92931010022212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16251798947904 + 4970202066025 = 4031352^2 + 2229395^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222001013929 - 2⁹ = 21222001013417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21222001013894 and 21222001013903.

It is not a weakly prime, because it can be changed into another prime (21222001013959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611000506964 + 10611000506965.

It is an arithmetic number, because the mean of its divisors is an integer number (10611000506965).

Almost surely, 2^{21222001013929} is an apocalyptic number.

It is an amenable number.

21222001013929 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222001013929 is an equidigital number, since it uses as much as digits as its factorization.

21222001013929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The spelling of 21222001013929 in words is "twenty-one trillion, two hundred twenty-two billion, one million, thirteen thousand, nine hundred twenty-nine".