1001022122121 has 16 divisors (see below), whose sum is σ = 1525421641728. Its totient is φ = 571992166800.

The previous prime is 1001022122101. The next prime is 1001022122147. The reversal of 1001022122121 is 1212212201001.

It is not a de Polignac number, because 1001022122121 - 2⁷ = 1001022121993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001022122121.

It is not an unprimeable number, because it can be changed into a prime (1001022122101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 242265 + ... + 1435526.

It is an arithmetic number, because the mean of its divisors is an integer number (95338852608).

Almost surely, 2^{1001022122121} is an apocalyptic number.

It is an amenable number.

1001022122121 is a deficient number, since it is larger than the sum of its proper divisors (524399519607).

1001022122121 is a wasteful number, since it uses less digits than its factorization.

1001022122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706212.

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

Adding to 1001022122121 its reverse (1212212201001), we get a palindrome (2213234323122).

The spelling of 1001022122121 in words is "one trillion, one billion, twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".