20021200001 has 16 divisors (see below), whose sum is σ = 21953213568. Its totient is φ = 18107971200.

The previous prime is 20021199977. The next prime is 20021200021. The reversal of 20021200001 is 10000212002.

It is not a de Polignac number, because 20021200001 - 2⁶ = 20021199937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20021200021) 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, 4116311 + ... + 4121171.

It is an arithmetic number, because the mean of its divisors is an integer number (1372075848).

Almost surely, 2^20021200001 is an apocalyptic number.

It is an amenable number.

20021200001 is a deficient number, since it is larger than the sum of its proper divisors (1932013567).

20021200001 is a wasteful number, since it uses less digits than its factorization.

20021200001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6712.

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 20021200001 its reverse (10000212002), we get a palindrome (30021412003).

It can be divided in two parts, 20021 and 200001, that added together give a palindrome (220022).

The spelling of 20021200001 in words is "twenty billion, twenty-one million, two hundred thousand, one".