21001101101012 has 12 divisors (see below), whose sum is σ = 36857233310100. Its totient is φ = 10470463012416.

The previous prime is 21001101100999. The next prime is 21001101101017. The reversal of 21001101101012 is 21010110110012.

It can be written as a sum of positive squares in 2 ways, for example, as 18658132084036 + 2342969016976 = 4319506^2 + 1530676^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21001101100984 and 21001101101002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001101101017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7521882953 + ... + 7521885744.

It is an arithmetic number, because the mean of its divisors is an integer number (3071436109175).

Almost surely, 2^{21001101101012} is an apocalyptic number.

It is an amenable number.

21001101101012 is a deficient number, since it is larger than the sum of its proper divisors (15856132209088).

21001101101012 is a wasteful number, since it uses less digits than its factorization.

21001101101012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15043769050 (or 15043769048 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21001101101012 its reverse (21010110110012), we get a palindrome (42011211211024).

The spelling of 21001101101012 in words is "twenty-one trillion, one billion, one hundred one million, one hundred one thousand, twelve".