21010012101 has 48 divisors (see below), whose sum is σ = 34169990400. Its totient is φ = 12366259488.

The previous prime is 21010012097. The next prime is 21010012117. The reversal of 21010012101 is 10121001012.

It is a happy number.

It is not a de Polignac number, because 21010012101 - 2² = 21010012097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010012171) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1416160 + ... + 1430918.

It is an arithmetic number, because the mean of its divisors is an integer number (711874800).

Almost surely, 2^21010012101 is an apocalyptic number.

It is an amenable number.

21010012101 is a deficient number, since it is larger than the sum of its proper divisors (13159978299).

21010012101 is a wasteful number, since it uses less digits than its factorization.

21010012101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14847 (or 14798 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21010012101 its reverse (10121001012), we get a palindrome (31131013113).

The spelling of 21010012101 in words is "twenty-one billion, ten million, twelve thousand, one hundred one".