1001200002021 has 24 divisors (see below), whose sum is σ = 1452651467904. Its totient is φ = 664484211360.

The previous prime is 1001200001999. The next prime is 1001200002133. The reversal of 1001200002021 is 1202000021001.

It is not a de Polignac number, because 1001200002021 - 2²¹ = 1001197904869 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1001200001994 and 1001200002012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001200002421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2006400 + ... + 2455206.

It is an arithmetic number, because the mean of its divisors is an integer number (60527144496).

Almost surely, 2^{1001200002021} is an apocalyptic number.

It is an amenable number.

1001200002021 is a deficient number, since it is larger than the sum of its proper divisors (451451465883).

1001200002021 is a wasteful number, since it uses less digits than its factorization.

1001200002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449921 (or 449918 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1001200002021 its reverse (1202000021001), we get a palindrome (2203200023022).

The spelling of 1001200002021 in words is "one trillion, one billion, two hundred million, two thousand, twenty-one".