20021021012002 has 16 divisors (see below), whose sum is σ = 31309749408960. Its totient is φ = 9593222878512.

The previous prime is 20021021011969. The next prime is 20021021012023. The reversal of 20021021012002 is 20021012012002.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2196246102 + ... + 2196255217.

It is an arithmetic number, because the mean of its divisors is an integer number (1956859338060).

Almost surely, 2^{20021021012002} is an apocalyptic number.

20021021012002 is a deficient number, since it is larger than the sum of its proper divisors (11288728396958).

20021021012002 is a wasteful number, since it uses less digits than its factorization.

20021021012002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4392501417.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20021021012002 its reverse (20021012012002), we get a palindrome (40042033024004).

Subtracting from 20021021012002 its reverse (20021012012002), we obtain a square (9000000 = 3000²).

The spelling of 20021021012002 in words is "twenty trillion, twenty-one billion, twenty-one million, twelve thousand, two".