1212001110021 has 16 divisors (see below), whose sum is σ = 1741251625344. Its totient is φ = 745442977344.

The previous prime is 1212001110013. The next prime is 1212001110041. The reversal of 1212001110021 is 1200111002121.

It is not a de Polignac number, because 1212001110021 - 2³ = 1212001110013 is a prime.

It is a super-2 number, since 2×1212001110021² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1212001109979 and 1212001110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212001110041) 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, 8340786 + ... + 8484851.

It is an arithmetic number, because the mean of its divisors is an integer number (108828226584).

Almost surely, 2^{1212001110021} is an apocalyptic number.

It is an amenable number.

1212001110021 is a deficient number, since it is larger than the sum of its proper divisors (529250515323).

1212001110021 is a wasteful number, since it uses less digits than its factorization.

1212001110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16827500.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1212001110021 its reverse (1200111002121), we get a palindrome (2412112112142).

The spelling of 1212001110021 in words is "one trillion, two hundred twelve billion, one million, one hundred ten thousand, twenty-one".