1200002000021 has 48 divisors (see below), whose sum is σ = 1343248885440. Its totient is φ = 1071088128000.

The previous prime is 1200002000017. The next prime is 1200002000081.

1200002000021 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1200002000021 - 2² = 1200002000017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200001999972 and 1200002000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200002000081) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 851668565 + ... + 851669973.

It is an arithmetic number, because the mean of its divisors is an integer number (27984351780).

Almost surely, 2^{1200002000021} is an apocalyptic number.

1200002000021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1200002000021 is a deficient number, since it is larger than the sum of its proper divisors (143246885419).

1200002000021 is a wasteful number, since it uses less digits than its factorization.

1200002000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066 (or 2055 counting only the distinct ones).

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

The spelling of 1200002000021 in words is "one trillion, two hundred billion, two million, twenty-one", and thus it is an aban number.