21210231101 has 4 divisors (see below), whose sum is σ = 22457891772. Its totient is φ = 19962570432.

The previous prime is 21210231089. The next prime is 21210231121. The reversal of 21210231101 is 10113201212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18755028601 + 2455202500 = 136949^2 + 49550^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210231101 - 2⁶ = 21210231037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210231121) 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, 623830310 + ... + 623830343.

It is an arithmetic number, because the mean of its divisors is an integer number (5614472943).

Almost surely, 2^21210231101 is an apocalyptic number.

It is an amenable number.

21210231101 is a deficient number, since it is larger than the sum of its proper divisors (1247660671).

21210231101 is a wasteful number, since it uses less digits than its factorization.

21210231101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247660670.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21210231101 its reverse (10113201212), we get a palindrome (31323432313).

The spelling of 21210231101 in words is "twenty-one billion, two hundred ten million, two hundred thirty-one thousand, one hundred one".