21032101231 has 4 divisors (see below), whose sum is σ = 21033626832. Its totient is φ = 21030575632.

The previous prime is 21032101229. The next prime is 21032101261. The reversal of 21032101231 is 13210123012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21032101231 - 2¹ = 21032101229 is a prime.

It is a super-2 number, since 2×21032101231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032101261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 741931 + ... + 769756.

It is an arithmetic number, because the mean of its divisors is an integer number (5258406708).

Almost surely, 2^21032101231 is an apocalyptic number.

21032101231 is a deficient number, since it is larger than the sum of its proper divisors (1525601).

21032101231 is a wasteful number, since it uses less digits than its factorization.

21032101231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1525600.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21032101231 its reverse (13210123012), we get a palindrome (34242224243).

The spelling of 21032101231 in words is "twenty-one billion, thirty-two million, one hundred one thousand, two hundred thirty-one".