1200210120021 has 24 divisors (see below), whose sum is σ = 1759471202272. Its totient is φ = 727199272800.

The previous prime is 1200210120019. The next prime is 1200210120023.

1200210120021 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (1200210120019) and next prime (1200210120023).

It is not a de Polignac number, because 1200210120021 - 2¹ = 1200210120019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200210119979 and 1200210120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200210120023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 865686 + ... + 1774776.

Almost surely, 2^{1200210120021} is an apocalyptic number.

1200210120021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1200210120021 is a deficient number, since it is larger than the sum of its proper divisors (559261082251).

1200210120021 is a wasteful number, since it uses less digits than its factorization.

1200210120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912753 (or 912742 counting only the distinct ones).

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

It can be divided in two parts, 1200210 and 120021, that added together give a palindrome (1320231).

The spelling of 1200210120021 in words is "one trillion, two hundred billion, two hundred ten million, one hundred twenty thousand, twenty-one".