21210120010101 has 16 divisors (see below), whose sum is σ = 30942629909568. Its totient is φ = 12816473913600.

The previous prime is 21210120010081. The next prime is 21210120010139. The reversal of 21210120010101 is 10101002101212.

It is not a de Polignac number, because 21210120010101 - 2³¹ = 21207972526453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210120090101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 953595570 + ... + 953617811.

It is an arithmetic number, because the mean of its divisors is an integer number (1933914369348).

Almost surely, 2^{21210120010101} is an apocalyptic number.

It is an amenable number.

21210120010101 is a deficient number, since it is larger than the sum of its proper divisors (9732509899467).

21210120010101 is a wasteful number, since it uses less digits than its factorization.

21210120010101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1907213732.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21210120010101 its reverse (10101002101212), we get a palindrome (31311122111313).

It can be divided in two parts, 212101 and 20010101, that added together give a palindrome (20222202).

The spelling of 21210120010101 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty million, ten thousand, one hundred one".