20021001029 has 2 divisors, whose sum is σ = 20021001030. Its totient is φ = 20021001028.

The previous prime is 20021000981. The next prime is 20021001067. The reversal of 20021001029 is 92010012002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14589016225 + 5431984804 = 120785^2 + 73702^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021001029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021000998 and 20021001016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021001079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010500514 + 10010500515.

It is an arithmetic number, because the mean of its divisors is an integer number (10010500515).

Almost surely, 2^20021001029 is an apocalyptic number.

It is an amenable number.

20021001029 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021001029 is an equidigital number, since it uses as much as digits as its factorization.

20021001029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The spelling of 20021001029 in words is "twenty billion, twenty-one million, one thousand, twenty-nine".