1021221010121 has 8 divisors (see below), whose sum is σ = 1099808888640. Its totient is φ = 942637762512.

The previous prime is 1021221010079. The next prime is 1021221010133. The reversal of 1021221010121 is 1210101221201.

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 1021221010121 - 2¹⁸ = 1021220747977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021221010096 and 1021221010105.

It is not an unprimeable number, because it can be changed into a prime (1021221010321) by changing a digit.

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, 692795 + ... + 1588208.

It is an arithmetic number, because the mean of its divisors is an integer number (137476111080).

Almost surely, 2^{1021221010121} is an apocalyptic number.

It is an amenable number.

1021221010121 is a deficient number, since it is larger than the sum of its proper divisors (78587878519).

1021221010121 is a wasteful number, since it uses less digits than its factorization.

1021221010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2315455.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1021221010121 its reverse (1210101221201), we get a palindrome (2231322231322).

The spelling of 1021221010121 in words is "one trillion, twenty-one billion, two hundred twenty-one million, ten thousand, one hundred twenty-one".