21011212101 has 48 divisors (see below), whose sum is σ = 33157857600. Its totient is φ = 11781665280.

The previous prime is 21011212093. The next prime is 21011212121. The reversal of 21011212101 is 10121211012.

It is not a de Polignac number, because 21011212101 - 2³ = 21011212093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011212121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 335235 + ... + 392943.

It is an arithmetic number, because the mean of its divisors is an integer number (690788700).

Almost surely, 2^21011212101 is an apocalyptic number.

It is an amenable number.

21011212101 is a deficient number, since it is larger than the sum of its proper divisors (12146645499).

21011212101 is a wasteful number, since it uses less digits than its factorization.

21011212101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57810 (or 57799 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21011212101 its reverse (10121211012), we get a palindrome (31132423113).

The spelling of 21011212101 in words is "twenty-one billion, eleven million, two hundred twelve thousand, one hundred one".