21231022101 has 32 divisors (see below), whose sum is σ = 30566688768. Its totient is φ = 13060120320.

The previous prime is 21231022093. The next prime is 21231022139. The reversal of 21231022101 is 10122013212.

It is not a de Polignac number, because 21231022101 - 2³ = 21231022093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231022301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 535380 + ... + 573666.

It is an arithmetic number, because the mean of its divisors is an integer number (955209024).

Almost surely, 2^21231022101 is an apocalyptic number.

It is an amenable number.

21231022101 is a deficient number, since it is larger than the sum of its proper divisors (9335666667).

21231022101 is a wasteful number, since it uses less digits than its factorization.

21231022101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38521.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21231022101 its reverse (10122013212), we get a palindrome (31353035313).

The spelling of 21231022101 in words is "twenty-one billion, two hundred thirty-one million, twenty-two thousand, one hundred one".