20211012011 has 4 divisors (see below), whose sum is σ = 20495674224. Its totient is φ = 19926349800.

The previous prime is 20211011993. The next prime is 20211012013. The reversal of 20211012011 is 11021011202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11021011202 = 2 ⋅5510505601.

It is a cyclic number.

It is not a de Polignac number, because 20211012011 - 2¹⁰ = 20211010987 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20211011983 and 20211012001.

It is not an unprimeable number, because it can be changed into a prime (20211012013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142331000 + ... + 142331141.

It is an arithmetic number, because the mean of its divisors is an integer number (5123918556).

Almost surely, 2^20211012011 is an apocalyptic number.

20211012011 is a deficient number, since it is larger than the sum of its proper divisors (284662213).

20211012011 is an equidigital number, since it uses as much as digits as its factorization.

20211012011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284662212.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20211012011 its reverse (11021011202), we get a palindrome (31232023213).

The spelling of 20211012011 in words is "twenty billion, two hundred eleven million, twelve thousand, eleven".