21101010126 has 128 divisors (see below), whose sum is σ = 50669813760. Its totient is φ = 5731689600.

The previous prime is 21101010061. The next prime is 21101010137. The reversal of 21101010126 is 62101010112.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27874140 + ... + 27874896.

It is an arithmetic number, because the mean of its divisors is an integer number (395857920).

Almost surely, 2^21101010126 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21101010126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25334906880).

21101010126 is an abundant number, since it is smaller than the sum of its proper divisors (29568803634).

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

21101010126 is a wasteful number, since it uses less digits than its factorization.

21101010126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21101010126 its reverse (62101010112), we get a palindrome (83202020238).

The spelling of 21101010126 in words is "twenty-one billion, one hundred one million, ten thousand, one hundred twenty-six".