21020102210101 has 8 divisors (see below), whose sum is σ = 21256372431000. Its totient is φ = 20783833973760.

The previous prime is 21020102210087. The next prime is 21020102210113. The reversal of 21020102210101 is 10101220102012.

It can be written as a sum of positive squares in 4 ways, for example, as 1200920098225 + 19819182111876 = 1095865^2 + 4451874^2 .

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 21020102210101 - 2¹⁹ = 21020101685813 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 (21020102210501) 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, 34986091 + ... + 35581831.

It is an arithmetic number, because the mean of its divisors is an integer number (2657046553875).

Almost surely, 2^{21020102210101} is an apocalyptic number.

It is an amenable number.

21020102210101 is a deficient number, since it is larger than the sum of its proper divisors (236270220899).

21020102210101 is an equidigital number, since it uses as much as digits as its factorization.

21020102210101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992279.

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

Adding to 21020102210101 its reverse (10101220102012), we get a palindrome (31121322312113).

The spelling of 21020102210101 in words is "twenty-one trillion, twenty billion, one hundred two million, two hundred ten thousand, one hundred one".