21003031101 has 16 divisors (see below), whose sum is σ = 30160807040. Its totient is φ = 12923824320.

The previous prime is 21003031037. The next prime is 21003031117. The reversal of 21003031101 is 10113030012.

It is not a de Polignac number, because 21003031101 - 2⁶ = 21003031037 is a prime.

It is a super-2 number, since 2×21003031101² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003031151) 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, 818811 + ... + 844071.

It is an arithmetic number, because the mean of its divisors is an integer number (1885050440).

Almost surely, 2^21003031101 is an apocalyptic number.

It is an amenable number.

21003031101 is a deficient number, since it is larger than the sum of its proper divisors (9157775939).

21003031101 is a wasteful number, since it uses less digits than its factorization.

21003031101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46596.

The product of its (nonzero) digits is 18, while the sum is 12.

Adding to 21003031101 its reverse (10113030012), we get a palindrome (31116061113).

The spelling of 21003031101 in words is "twenty-one billion, three million, thirty-one thousand, one hundred one".