21010012202121 has 16 divisors (see below), whose sum is σ = 29746182816000. Its totient is φ = 13144979812608.

The previous prime is 21010012202111. The next prime is 21010012202141. The reversal of 21010012202121 is 12120221001012.

It is not a de Polignac number, because 21010012202121 - 2⁵ = 21010012202089 is a prime.

It is a super-2 number, since 2×21010012202121² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21010012202121.

It is not an unprimeable number, because it can be changed into a prime (21010012202111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 590184241 + ... + 590219838.

It is an arithmetic number, because the mean of its divisors is an integer number (1859136426000).

Almost surely, 2^{21010012202121} is an apocalyptic number.

It is an amenable number.

21010012202121 is a deficient number, since it is larger than the sum of its proper divisors (8736170613879).

21010012202121 is a wasteful number, since it uses less digits than its factorization.

21010012202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180404448.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21010012202121 its reverse (12120221001012), we get a palindrome (33130233203133).

The spelling of 21010012202121 in words is "twenty-one trillion, ten billion, twelve million, two hundred two thousand, one hundred twenty-one".