20211200021 has 8 divisors (see below), whose sum is σ = 21140052864. Its totient is φ = 19286522640.

The previous prime is 20211200003. The next prime is 20211200027. The reversal of 20211200021 is 12000211202.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211200021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20211199975 and 20211200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211200027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1033961 + ... + 1053326.

It is an arithmetic number, because the mean of its divisors is an integer number (2642506608).

Almost surely, 2^20211200021 is an apocalyptic number.

It is an amenable number.

20211200021 is a deficient number, since it is larger than the sum of its proper divisors (928852843).

20211200021 is a wasteful number, since it uses less digits than its factorization.

20211200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2087731.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20211200021 its reverse (12000211202), we get a palindrome (32211411223).

The spelling of 20211200021 in words is "twenty billion, two hundred eleven million, two hundred thousand, twenty-one".