21201010111012 has 6 divisors (see below), whose sum is σ = 37101767694278. Its totient is φ = 10600505055504.

The previous prime is 21201010110979. The next prime is 21201010111013. The reversal of 21201010111012 is 21011101010212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17057114760676 + 4143895350336 = 4130026^2 + 2035656^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21201010110983 and 21201010111001.

It is not an unprimeable number, because it can be changed into a prime (21201010111013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2650126263873 + ... + 2650126263880.

Almost surely, 2^{21201010111012} is an apocalyptic number.

It is an amenable number.

21201010111012 is a deficient number, since it is larger than the sum of its proper divisors (15900757583266).

21201010111012 is a wasteful number, since it uses less digits than its factorization.

21201010111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5300252527757 (or 5300252527755 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21201010111012 its reverse (21011101010212), we get a palindrome (42212111121224).

The spelling of 21201010111012 in words is "twenty-one trillion, two hundred one billion, ten million, one hundred eleven thousand, twelve".