21202101011 has 36 divisors (see below), whose sum is σ = 27083715984. Its totient is φ = 16538558400.

The previous prime is 21202100929. The next prime is 21202101049. The reversal of 21202101011 is 11010120212.

It is not a de Polignac number, because 21202101011 - 2¹⁰ = 21202099987 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202100983 and 21202101001.

It is not an unprimeable number, because it can be changed into a prime (21202101611) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 569921 + ... + 605981.

It is an arithmetic number, because the mean of its divisors is an integer number (752325444).

Almost surely, 2^21202101011 is an apocalyptic number.

21202101011 is a deficient number, since it is larger than the sum of its proper divisors (5881614973).

21202101011 is a wasteful number, since it uses less digits than its factorization.

21202101011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36172 (or 36152 counting only the distinct ones).

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

Adding to 21202101011 its reverse (11010120212), we get a palindrome (32212221223).

The spelling of 21202101011 in words is "twenty-one billion, two hundred two million, one hundred one thousand, eleven".