21201021101 has 12 divisors (see below), whose sum is σ = 23280674400. Its totient is φ = 19294526160.

The previous prime is 21201021073. The next prime is 21201021133. The reversal of 21201021101 is 10112010212.

It is not a de Polignac number, because 21201021101 - 2³⁴ = 4021151917 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 (21201021701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 871451 + ... + 895448.

It is an arithmetic number, because the mean of its divisors is an integer number (1940056200).

Almost surely, 2^21201021101 is an apocalyptic number.

It is an amenable number.

21201021101 is a deficient number, since it is larger than the sum of its proper divisors (2079653299).

21201021101 is a wasteful number, since it uses less digits than its factorization.

21201021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766996 (or 1766983 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21201021101 its reverse (10112010212), we get a palindrome (31313031313).

The spelling of 21201021101 in words is "twenty-one billion, two hundred one million, twenty-one thousand, one hundred one".