21131023101 has 8 divisors (see below), whose sum is σ = 29146238880. Its totient is φ = 13601578032.

The previous prime is 21131023057. The next prime is 21131023141. The reversal of 21131023101 is 10132013112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21131023101 - 2⁹ = 21131022589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131023141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121442575 + ... + 121442748.

It is an arithmetic number, because the mean of its divisors is an integer number (3643279860).

Almost surely, 2^21131023101 is an apocalyptic number.

It is an amenable number.

21131023101 is a deficient number, since it is larger than the sum of its proper divisors (8015215779).

21131023101 is a wasteful number, since it uses less digits than its factorization.

21131023101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242885355.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21131023101 its reverse (10132013112), we get a palindrome (31263036213).

The spelling of 21131023101 in words is "twenty-one billion, one hundred thirty-one million, twenty-three thousand, one hundred one".