21010012012106 has 16 divisors (see below), whose sum is σ = 34065418401000. Its totient is φ = 9660880555968.

The previous prime is 21010012012091. The next prime is 21010012012117. The reversal of 21010012012106 is 60121021001012.

It can be written as a sum of positive squares in 4 ways, for example, as 5795136621481 + 15214875390625 = 2407309^2 + 3900625^2 .

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, 1501995581 + ... + 1502009568.

Almost surely, 2^{21010012012106} is an apocalyptic number.

21010012012106 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21010012012106 is a deficient number, since it is larger than the sum of its proper divisors (13055406388894).

21010012012106 is a wasteful number, since it uses less digits than its factorization.

21010012012106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3004005433.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21010012012106 its reverse (60121021001012), we get a palindrome (81131033013118).

The spelling of 21010012012106 in words is "twenty-one trillion, ten billion, twelve million, twelve thousand, one hundred six".