20000021011 has 6 divisors (see below), whose sum is σ = 20384502740. Its totient is φ = 19622659368.

The previous prime is 20000021009. The next prime is 20000021023. The reversal of 20000021011 is 11012000002.

It is not a de Polignac number, because 20000021011 - 2¹ = 20000021009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20000020985 and 20000021003.

It is not an unprimeable number, because it can be changed into a prime (20000021051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3557181 + ... + 3562798.

Almost surely, 2^20000021011 is an apocalyptic number.

20000021011 is a deficient number, since it is larger than the sum of its proper divisors (384481729).

20000021011 is an frugal number, since it uses more digits than its factorization.

20000021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7120085 (or 7120032 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 20000021011 its reverse (11012000002), we get a palindrome (31012021013).

The spelling of 20000021011 in words is "twenty billion, twenty-one thousand, eleven".