21001212102122 has 16 divisors (see below), whose sum is σ = 36002162875200. Its totient is φ = 9000498225888.

The previous prime is 21001212102113. The next prime is 21001212102131. The reversal of 21001212102122 is 22120121210012.

It is an interprime number because it is at equal distance from previous prime (21001212102113) and next prime (21001212102131).

It is a self number, because there is not a number n which added to its sum of digits gives 21001212102122.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5363129 + ... + 8412227.

It is an arithmetic number, because the mean of its divisors is an integer number (2250135179700).

Almost surely, 2^{21001212102122} is an apocalyptic number.

21001212102122 is a deficient number, since it is larger than the sum of its proper divisors (15000950773078).

21001212102122 is a wasteful number, since it uses less digits than its factorization.

21001212102122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3541085.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21001212102122 its reverse (22120121210012), we get a palindrome (43121333312134).

The spelling of 21001212102122 in words is "twenty-one trillion, one billion, two hundred twelve million, one hundred two thousand, one hundred twenty-two".