10002111212121 has 64 divisors (see below), whose sum is σ = 15961875075072. Its totient is φ = 5447124663552.

The previous prime is 10002111212117. The next prime is 10002111212131. The reversal of 10002111212121 is 12121211120001.

It is a happy number.

It is not a de Polignac number, because 10002111212121 - 2² = 10002111212117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10002111212121.

It is not an unprimeable number, because it can be changed into a prime (10002111212111) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 156807391 + ... + 156871163.

It is an arithmetic number, because the mean of its divisors is an integer number (249404298048).

Almost surely, 2^{10002111212121} is an apocalyptic number.

It is an amenable number.

10002111212121 is a deficient number, since it is larger than the sum of its proper divisors (5959763862951).

10002111212121 is a wasteful number, since it uses less digits than its factorization.

10002111212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64982.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 10002111212121 its reverse (12121211120001), we get a palindrome (22123322332122).

The spelling of 10002111212121 in words is "ten trillion, two billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty-one".