21020122101 has 8 divisors (see below), whose sum is σ = 30574723104. Its totient is φ = 12739467920.

The previous prime is 21020122093. The next prime is 21020122129. The reversal of 21020122101 is 10122102012.

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 21020122101 - 2³ = 21020122093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020122001) 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, 318486666 + ... + 318486731.

It is an arithmetic number, because the mean of its divisors is an integer number (3821840388).

Almost surely, 2^21020122101 is an apocalyptic number.

It is an amenable number.

21020122101 is a deficient number, since it is larger than the sum of its proper divisors (9554601003).

21020122101 is a wasteful number, since it uses less digits than its factorization.

21020122101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636973411.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21020122101 its reverse (10122102012), we get a palindrome (31142224113).

The spelling of 21020122101 in words is "twenty-one billion, twenty million, one hundred twenty-two thousand, one hundred one".