1000021200021 has 20 divisors (see below), whose sum is σ = 1493887725792. Its totient is φ = 666667904328.

The previous prime is 1000021199993. The next prime is 1000021200043. The reversal of 1000021200021 is 1200021200001.

1000021200021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1000021200021 - 2³¹ = 997873716373 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 = 1000021199976 and 1000021200012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000021200071) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6048760 + ... + 6211886.

Almost surely, 2^{1000021200021} is an apocalyptic number.

It is an amenable number.

1000021200021 is a deficient number, since it is larger than the sum of its proper divisors (493866525771).

1000021200021 is an equidigital number, since it uses as much as digits as its factorization.

1000021200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238822 (or 238813 counting only the distinct ones).

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

Adding to 1000021200021 its reverse (1200021200001), we get a palindrome (2200042400022).

The spelling of 1000021200021 in words is "one trillion, twenty-one million, two hundred thousand, twenty-one".