21211210101 has 8 divisors (see below), whose sum is σ = 29770119520. Its totient is φ = 13396553712.

The previous prime is 21211210079. The next prime is 21211210103. The reversal of 21211210101 is 10101211212.

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

It is not a de Polignac number, because 21211210101 - 2⁶ = 21211210037 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 (21211210103) 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, 186063190 + ... + 186063303.

It is an arithmetic number, because the mean of its divisors is an integer number (3721264940).

Almost surely, 2^21211210101 is an apocalyptic number.

It is an amenable number.

21211210101 is a deficient number, since it is larger than the sum of its proper divisors (8558909419).

21211210101 is a wasteful number, since it uses less digits than its factorization.

21211210101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372126515.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21211210101 its reverse (10101211212), we get a palindrome (31312421313).

The spelling of 21211210101 in words is "twenty-one billion, two hundred eleven million, two hundred ten thousand, one hundred one".