10101212121221 has 8 divisors (see below), whose sum is σ = 10878288954624. Its totient is φ = 9324143933040.

The previous prime is 10101212121211. The next prime is 10101212121239. The reversal of 10101212121221 is 12212121210101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10101212121221 - 2⁶ = 10101212121157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10101212121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10101212121211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375716 + ... + 4510386.

It is an arithmetic number, because the mean of its divisors is an integer number (1359786119328).

Almost surely, 2^{10101212121221} is an apocalyptic number.

It is an amenable number.

10101212121221 is a deficient number, since it is larger than the sum of its proper divisors (777076833403).

10101212121221 is a wasteful number, since it uses less digits than its factorization.

10101212121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4322611.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 10101212121221 its reverse (12212121210101), we get a palindrome (22313333331322).

The spelling of 10101212121221 in words is "ten trillion, one hundred one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twenty-one".