21102120101011 has 16 divisors (see below), whose sum is σ = 21629612369664. Its totient is φ = 20580964788384.

The previous prime is 21102120101003. The next prime is 21102120101017. The reversal of 21102120101011 is 11010102120112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21102120101011 - 2³ = 21102120101003 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102120100982 and 21102120101000.

It is not an unprimeable number, because it can be changed into a prime (21102120101017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32339400 + ... + 32985466.

It is an arithmetic number, because the mean of its divisors is an integer number (1351850773104).

Almost surely, 2^{21102120101011} is an apocalyptic number.

21102120101011 is a deficient number, since it is larger than the sum of its proper divisors (527492268653).

21102120101011 is a wasteful number, since it uses less digits than its factorization.

21102120101011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650970.

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

Adding to 21102120101011 its reverse (11010102120112), we get a palindrome (32112222221123).

The spelling of 21102120101011 in words is "twenty-one trillion, one hundred two billion, one hundred twenty million, one hundred one thousand, eleven".