21203031101 has 16 divisors (see below), whose sum is σ = 24484602240. Its totient is φ = 17984788800.

The previous prime is 21203031079. The next prime is 21203031107. The reversal of 21203031101 is 10113030212.

It is a cyclic number.

It is not a de Polignac number, because 21203031101 - 2²² = 21198836797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203031107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1596155 + ... + 1609383.

It is an arithmetic number, because the mean of its divisors is an integer number (1530287640).

Almost surely, 2^21203031101 is an apocalyptic number.

It is an amenable number.

21203031101 is a deficient number, since it is larger than the sum of its proper divisors (3281571139).

21203031101 is a wasteful number, since it uses less digits than its factorization.

21203031101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15604.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21203031101 its reverse (10113030212), we get a palindrome (31316061313).

The spelling of 21203031101 in words is "twenty-one billion, two hundred three million, thirty-one thousand, one hundred one".