21012110102011 has 32 divisors (see below), whose sum is σ = 24889872268800. Its totient is φ = 17355787142400.

The previous prime is 21012110101963. The next prime is 21012110102023. The reversal of 21012110102011 is 11020101121012.

It is a happy number.

It is not a de Polignac number, because 21012110102011 - 2³⁵ = 20977750363643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21012110101982 and 21012110102000.

It is not an unprimeable number, because it can be changed into a prime (21012110102611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 220345980 + ... + 220441318.

It is an arithmetic number, because the mean of its divisors is an integer number (777808508400).

Almost surely, 2^{21012110102011} is an apocalyptic number.

21012110102011 is a deficient number, since it is larger than the sum of its proper divisors (3877762166789).

21012110102011 is a wasteful number, since it uses less digits than its factorization.

21012110102011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97459.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21012110102011 its reverse (11020101121012), we get a palindrome (32032211223023).

The spelling of 21012110102011 in words is "twenty-one trillion, twelve billion, one hundred ten million, one hundred two thousand, eleven".