21201101012 has 48 divisors (see below), whose sum is σ = 45719775360. Its totient is φ = 8376988032.

The previous prime is 21201101003. The next prime is 21201101083. The reversal of 21201101012 is 21010110212.

It is a junction number, because it is equal to n+sod(n) for n = 21201100984 and 21201101002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265814 + ... + 336242.

It is an arithmetic number, because the mean of its divisors is an integer number (952495320).

Almost surely, 2^21201101012 is an apocalyptic number.

It is an amenable number.

21201101012 is an abundant number, since it is smaller than the sum of its proper divisors (24518674348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21201101012 is a wasteful number, since it uses less digits than its factorization.

21201101012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71280 (or 71278 counting only the distinct ones).

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

Adding to 21201101012 its reverse (21010110212), we get a palindrome (42211211224).

The spelling of 21201101012 in words is "twenty-one billion, two hundred one million, one hundred one thousand, twelve".