21311220101 has 8 divisors (see below), whose sum is σ = 22278462144. Its totient is φ = 20347367040.

The previous prime is 21311220089. The next prime is 21311220131. The reversal of 21311220101 is 10102211312.

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

It is a cyclic number.

It is not a de Polignac number, because 21311220101 - 2¹⁸ = 21310957957 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 (21311220131) 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, 834380 + ... + 859541.

It is an arithmetic number, because the mean of its divisors is an integer number (2784807768).

Almost surely, 2^21311220101 is an apocalyptic number.

It is an amenable number.

21311220101 is a deficient number, since it is larger than the sum of its proper divisors (967242043).

21311220101 is a wasteful number, since it uses less digits than its factorization.

21311220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694491.

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

Adding to 21311220101 its reverse (10102211312), we get a palindrome (31413431413).

The spelling of 21311220101 in words is "twenty-one billion, three hundred eleven million, two hundred twenty thousand, one hundred one".