21210102120101 has 4 divisors (see below), whose sum is σ = 21350566372704. Its totient is φ = 21069637867500.

The previous prime is 21210102120091. The next prime is 21210102120143. The reversal of 21210102120101 is 10102120101212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21210102120101 - 2¹⁴ = 21210102103717 is a prime.

It is a super-2 number, since 2×21210102120101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210102720101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70232126075 + ... + 70232126376.

It is an arithmetic number, because the mean of its divisors is an integer number (5337641593176).

Almost surely, 2^{21210102120101} is an apocalyptic number.

It is an amenable number.

21210102120101 is a deficient number, since it is larger than the sum of its proper divisors (140464252603).

21210102120101 is a wasteful number, since it uses less digits than its factorization.

21210102120101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140464252602.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21210102120101 its reverse (10102120101212), we get a palindrome (31312222221313).

It can be divided in two parts, 212 and 10102120101, that multiplied together give a palindrome (2141649461412).

The spelling of 21210102120101 in words is "twenty-one trillion, two hundred ten billion, one hundred two million, one hundred twenty thousand, one hundred one".