20011000021011 has 12 divisors (see below), whose sum is σ = 28932279989080. Its totient is φ = 13327973366400.

The previous prime is 20011000020983. The next prime is 20011000021043. The reversal of 20011000021011 is 11012000011002.

It is a happy number.

It is not a de Polignac number, because 20011000021011 - 2⁷ = 20011000020883 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 = 20011000020984 and 20011000021002.

It is not an unprimeable number, because it can be changed into a prime (20011000021081) 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, 1057766206 + ... + 1057785123.

Almost surely, 2^{20011000021011} is an apocalyptic number.

20011000021011 is a deficient number, since it is larger than the sum of its proper divisors (8921279968069).

20011000021011 is a wasteful number, since it uses less digits than its factorization.

20011000021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115552386 (or 2115552383 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20011000021011 its reverse (11012000011002), we get a palindrome (31023000032013).

The spelling of 20011000021011 in words is "twenty trillion, eleven billion, twenty-one thousand, eleven".