21010121101 has 8 divisors (see below), whose sum is σ = 21281138424. Its totient is φ = 20740339200.

The previous prime is 21010120951. The next prime is 21010121137. The reversal of 21010121101 is 10112101012.

It can be written as a sum of positive squares in 4 ways, for example, as 724955625 + 20285165476 = 26925^2 + 142426^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21010121101 - 2¹³ = 21010112909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010121161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274600 + ... + 342673.

It is an arithmetic number, because the mean of its divisors is an integer number (2660142303).

Almost surely, 2^21010121101 is an apocalyptic number.

It is an amenable number.

21010121101 is a deficient number, since it is larger than the sum of its proper divisors (271017323).

21010121101 is a wasteful number, since it uses less digits than its factorization.

21010121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617711.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21010121101 its reverse (10112101012), we get a palindrome (31122222113).

The spelling of 21010121101 in words is "twenty-one billion, ten million, one hundred twenty-one thousand, one hundred one".