21021012222029 has 2 divisors, whose sum is σ = 21021012222030. Its totient is φ = 21021012222028.

The previous prime is 21021012221941. The next prime is 21021012222047. The reversal of 21021012222029 is 92022221012012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14039934060100 + 6981078161929 = 3746990^2 + 2642173^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21021012222029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21021012221989 and 21021012222007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21021012221029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510506111014 + 10510506111015.

It is an arithmetic number, because the mean of its divisors is an integer number (10510506111015).

Almost surely, 2^{21021012222029} is an apocalyptic number.

It is an amenable number.

21021012222029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021012222029 is an equidigital number, since it uses as much as digits as its factorization.

21021012222029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 21021012222029 in words is "twenty-one trillion, twenty-one billion, twelve million, two hundred twenty-two thousand, twenty-nine".