21021122101 has 8 divisors (see below), whose sum is σ = 24051231360. Its totient is φ = 17997785808.

The previous prime is 21021122071. The next prime is 21021122137. The reversal of 21021122101 is 10122112012.

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 21021122101 - 2³¹ = 18873638453 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 (21021128101) 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, 1686586 + ... + 1699003.

It is an arithmetic number, because the mean of its divisors is an integer number (3006403920).

Almost surely, 2^21021122101 is an apocalyptic number.

It is an amenable number.

21021122101 is a deficient number, since it is larger than the sum of its proper divisors (3030109259).

21021122101 is an equidigital number, since it uses as much as digits as its factorization.

21021122101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3386483.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21021122101 its reverse (10122112012), we get a palindrome (31143234113).

The spelling of 21021122101 in words is "twenty-one billion, twenty-one million, one hundred twenty-two thousand, one hundred one".