20021433021 has 12 divisors (see below), whose sum is σ = 28958780448. Its totient is φ = 13329653064.

The previous prime is 20021432971. The next prime is 20021433101. The reversal of 20021433021 is 12033412002.

It is not a de Polignac number, because 20021433021 - 2⁶ = 20021432957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021432985 and 20021433003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021413021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1490355 + ... + 1503728.

It is an arithmetic number, because the mean of its divisors is an integer number (2413231704).

Almost surely, 2^20021433021 is an apocalyptic number.

It is an amenable number.

20021433021 is a deficient number, since it is larger than the sum of its proper divisors (8937347427).

20021433021 is a wasteful number, since it uses less digits than its factorization.

20021433021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2994832 (or 2994829 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20021433021 its reverse (12033412002), we get a palindrome (32054845023).

The spelling of 20021433021 in words is "twenty billion, twenty-one million, four hundred thirty-three thousand, twenty-one".