211102120021 has 16 divisors (see below), whose sum is σ = 236011224960. Its totient is φ = 187479149760.

The previous prime is 211102120013. The next prime is 211102120093. The reversal of 211102120021 is 120021201112.

It is a cyclic number.

It is not a de Polignac number, because 211102120021 - 2³ = 211102120013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211102119983 and 211102120010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211102123021) 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, 882625 + ... + 1096006.

It is an arithmetic number, because the mean of its divisors is an integer number (14750701560).

Almost surely, 2^211102120021 is an apocalyptic number.

It is an amenable number.

211102120021 is a deficient number, since it is larger than the sum of its proper divisors (24909104939).

211102120021 is a wasteful number, since it uses less digits than its factorization.

211102120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978956.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211102120021 its reverse (120021201112), we get a palindrome (331123321133).

The spelling of 211102120021 in words is "two hundred eleven billion, one hundred two million, one hundred twenty thousand, twenty-one".