1021211111121 has 8 divisors (see below), whose sum is σ = 1365655216224. Its totient is φ = 678787206720.

The previous prime is 1021211111113. The next prime is 1021211111131. The reversal of 1021211111121 is 1211111121201.

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

It is not a de Polignac number, because 1021211111121 - 2³ = 1021211111113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021211111121.

It is not an unprimeable number, because it can be changed into a prime (1021211111131) 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, 505048995 + ... + 505051016.

It is an arithmetic number, because the mean of its divisors is an integer number (170706902028).

Almost surely, 2^{1021211111121} is an apocalyptic number.

It is an amenable number.

1021211111121 is a deficient number, since it is larger than the sum of its proper divisors (344444105103).

1021211111121 is a wasteful number, since it uses less digits than its factorization.

1021211111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010100351.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1021211111121 its reverse (1211111121201), we get a palindrome (2232322232322).

The spelling of 1021211111121 in words is "one trillion, twenty-one billion, two hundred eleven million, one hundred eleven thousand, one hundred twenty-one".