21020210101 has 8 divisors (see below), whose sum is σ = 22932731808. Its totient is φ = 19107954000.

The previous prime is 21020210077. The next prime is 21020210129. The reversal of 21020210101 is 10101202012.

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 21020210101 - 2¹⁵ = 21020177333 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 (21020210161) 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, 122446 + ... + 238816.

It is an arithmetic number, because the mean of its divisors is an integer number (2866591476).

Almost surely, 2^21020210101 is an apocalyptic number.

It is an amenable number.

21020210101 is a deficient number, since it is larger than the sum of its proper divisors (1912521707).

21020210101 is a wasteful number, since it uses less digits than its factorization.

21020210101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132803.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21020210101 its reverse (10101202012), we get a palindrome (31121412113).

The spelling of 21020210101 in words is "twenty-one billion, twenty million, two hundred ten thousand, one hundred one".