21002210122121 has 8 divisors (see below), whose sum is σ = 21929193918720. Its totient is φ = 20076380011072.

The previous prime is 21002210122097. The next prime is 21002210122139. The reversal of 21002210122121 is 12122101220012.

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 21002210122121 - 2¹⁰ = 21002210121097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21002210122121.

It is not an unprimeable number, because it can be changed into a prime (21002210122021) 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, 288384176 + ... + 288456993.

It is an arithmetic number, because the mean of its divisors is an integer number (2741149239840).

Almost surely, 2^{21002210122121} is an apocalyptic number.

It is an amenable number.

21002210122121 is a deficient number, since it is larger than the sum of its proper divisors (926983796599).

21002210122121 is a wasteful number, since it uses less digits than its factorization.

21002210122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576842775.

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

Adding to 21002210122121 its reverse (12122101220012), we get a palindrome (33124311342133).

The spelling of 21002210122121 in words is "twenty-one trillion, two billion, two hundred ten million, one hundred twenty-two thousand, one hundred twenty-one".