21101001101012 has 24 divisors (see below), whose sum is σ = 42202641464256. Its totient is φ = 9043149201408.

The previous prime is 21101001100997. The next prime is 21101001101027. The reversal of 21101001101012 is 21010110010112.

It is an interprime number because it is at equal distance from previous prime (21101001100997) and next prime (21101001101027).

It is a junction number, because it is equal to n+sod(n) for n = 21101001100984 and 21101001101002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3815213 + ... + 7533780.

It is an arithmetic number, because the mean of its divisors is an integer number (1758443394344).

Almost surely, 2^{21101001101012} is an apocalyptic number.

It is an amenable number.

21101001101012 is an abundant number, since it is smaller than the sum of its proper divisors (21101640363244).

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

21101001101012 is a wasteful number, since it uses less digits than its factorization.

21101001101012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11415407 (or 11415405 counting only the distinct ones).

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

Adding to 21101001101012 its reverse (21010110010112), we get a palindrome (42111111111124).

The spelling of 21101001101012 in words is "twenty-one trillion, one hundred one billion, one million, one hundred one thousand, twelve".