20021000211 has 12 divisors (see below), whose sum is σ = 28939226992. Its totient is φ = 13338100656.

The previous prime is 20021000201. The next prime is 20021000267. The reversal of 20021000211 is 11200012002.

It is not a de Polignac number, because 20021000211 - 2¹⁷ = 20020869139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021000193 and 20021000202.

It is not an unprimeable number, because it can be changed into a prime (20021000201) 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, 755656 + ... + 781701.

Almost surely, 2^20021000211 is an apocalyptic number.

20021000211 is a deficient number, since it is larger than the sum of its proper divisors (8918226781).

20021000211 is a wasteful number, since it uses less digits than its factorization.

20021000211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538810 (or 1538807 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20021000211 its reverse (11200012002), we get a palindrome (31221012213).

The spelling of 20021000211 in words is "twenty billion, twenty-one million, two hundred eleven", and thus it is an aban number.