20021221203033 has 16 divisors (see below), whose sum is σ = 26700861597696. Its totient is φ = 13344531125520.

The previous prime is 20021221202921. The next prime is 20021221203101. The reversal of 20021221203033 is 33030212212002.

It is a happy number.

It is not a de Polignac number, because 20021221203033 - 2²⁸ = 20020952767577 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20021221203133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 358858966 + ... + 358914752.

It is an arithmetic number, because the mean of its divisors is an integer number (1668803849856).

Almost surely, 2^{20021221203033} is an apocalyptic number.

It is an amenable number.

20021221203033 is a deficient number, since it is larger than the sum of its proper divisors (6679640394663).

20021221203033 is a wasteful number, since it uses less digits than its factorization.

20021221203033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80084.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20021221203033 its reverse (33030212212002), we get a palindrome (53051433415035).

The spelling of 20021221203033 in words is "twenty trillion, twenty-one billion, two hundred twenty-one million, two hundred three thousand, thirty-three".