21012211002011 has 4 divisors (see below), whose sum is σ = 22248223413912. Its totient is φ = 19776198590112.

The previous prime is 21012211001983. The next prime is 21012211002019. The reversal of 21012211002011 is 11020011221012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21012211002011 - 2¹⁸ = 21012210739867 is a prime.

It is a super-2 number, since 2×21012211002011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012211002019) 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, 618006205925 + ... + 618006205958.

It is an arithmetic number, because the mean of its divisors is an integer number (5562055853478).

Almost surely, 2^{21012211002011} is an apocalyptic number.

21012211002011 is a deficient number, since it is larger than the sum of its proper divisors (1236012411901).

21012211002011 is a wasteful number, since it uses less digits than its factorization.

21012211002011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236012411900.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21012211002011 its reverse (11020011221012), we get a palindrome (32032222223023).

The spelling of 21012211002011 in words is "twenty-one trillion, twelve billion, two hundred eleven million, two thousand, eleven".