21003132101 has 12 divisors (see below), whose sum is σ = 24832746540. Its totient is φ = 17707556160.

The previous prime is 21003132091. The next prime is 21003132109. The reversal of 21003132101 is 10123130012.

It can be written as a sum of positive squares in 2 ways, for example, as 9203524225 + 11799607876 = 95935^2 + 108626^2 .

It is not a de Polignac number, because 21003132101 - 2⁶ = 21003132037 is a prime.

It is a super-2 number, since 2×21003132101² (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 (21003132109) 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, 3510416 + ... + 3516393.

It is an arithmetic number, because the mean of its divisors is an integer number (2069395545).

Almost surely, 2^21003132101 is an apocalyptic number.

It is an amenable number.

21003132101 is a deficient number, since it is larger than the sum of its proper divisors (3829614439).

21003132101 is an equidigital number, since it uses as much as digits as its factorization.

21003132101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7026884 (or 7026877 counting only the distinct ones).

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

Adding to 21003132101 its reverse (10123130012), we get a palindrome (31126262113).

The spelling of 21003132101 in words is "twenty-one billion, three million, one hundred thirty-two thousand, one hundred one".