10001212021221 has 8 divisors (see below), whose sum is σ = 13342697741184. Its totient is φ = 6663600491040.

The previous prime is 10001212021217. The next prime is 10001212021231. The reversal of 10001212021221 is 12212021210001.

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

It is not a de Polignac number, because 10001212021221 - 2² = 10001212021217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10001212021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001212021231) 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, 968541421 + ... + 968551746.

It is an arithmetic number, because the mean of its divisors is an integer number (1667837217648).

Almost surely, 2^{10001212021221} is an apocalyptic number.

It is an amenable number.

10001212021221 is a deficient number, since it is larger than the sum of its proper divisors (3341485719963).

10001212021221 is a wasteful number, since it uses less digits than its factorization.

10001212021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937094891.

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

Adding to 10001212021221 its reverse (12212021210001), we get a palindrome (22213233231222).

The spelling of 10001212021221 in words is "ten trillion, one billion, two hundred twelve million, twenty-one thousand, two hundred twenty-one".