21201100201012 has 72 divisors (see below), whose sum is σ = 40358851083936. Its totient is φ = 9737836426752.

The previous prime is 21201100200991. The next prime is 21201100201013. The reversal of 21201100201012 is 21010200110212.

It is a junction number, because it is equal to n+sod(n) for n = 21201100200983 and 21201100201001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201100201013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68093763 + ... + 68404405.

It is an arithmetic number, because the mean of its divisors is an integer number (560539598388).

Almost surely, 2^{21201100201012} is an apocalyptic number.

It is an amenable number.

21201100201012 is a deficient number, since it is larger than the sum of its proper divisors (19157750882924).

21201100201012 is a wasteful number, since it uses less digits than its factorization.

21201100201012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312097 (or 312078 counting only the distinct ones).

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

Adding to 21201100201012 its reverse (21010200110212), we get a palindrome (42211300311224).

The spelling of 21201100201012 in words is "twenty-one trillion, two hundred one billion, one hundred million, two hundred one thousand, twelve".