1000122120021 has 16 divisors (see below), whose sum is σ = 1372591816704. Its totient is φ = 647423655984.

The previous prime is 1000122120017. The next prime is 1000122120037. The reversal of 1000122120021 is 1200212210001.

It is not a de Polignac number, because 1000122120021 - 2² = 1000122120017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1000122119979 and 1000122120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000122120091) 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, 27907545 + ... + 27943358.

It is an arithmetic number, because the mean of its divisors is an integer number (85786988544).

Almost surely, 2^{1000122120021} is an apocalyptic number.

It is an amenable number.

1000122120021 is a deficient number, since it is larger than the sum of its proper divisors (372469696683).

1000122120021 is a wasteful number, since it uses less digits than its factorization.

1000122120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55851080.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1000122120021 its reverse (1200212210001), we get a palindrome (2200334330022).

The spelling of 1000122120021 in words is "one trillion, one hundred twenty-two million, one hundred twenty thousand, twenty-one".