1000021001211 has 24 divisors (see below), whose sum is σ = 1445609496240. Its totient is φ = 666157176000.

The previous prime is 1000021001197. The next prime is 1000021001227. The reversal of 1000021001211 is 1121001200001.

It is a happy number.

It is not a de Polignac number, because 1000021001211 - 2¹⁴ = 1000020984827 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 = 1000021001193 and 1000021001202.

It is not an unprimeable number, because it can be changed into a prime (1000021001251) 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, 81289761 + ... + 81302061.

It is an arithmetic number, because the mean of its divisors is an integer number (60233729010).

Almost surely, 2^{1000021001211} is an apocalyptic number.

1000021001211 is a deficient number, since it is larger than the sum of its proper divisors (445588495029).

1000021001211 is a wasteful number, since it uses less digits than its factorization.

1000021001211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18667 (or 18664 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1000021001211 its reverse (1121001200001), we get a palindrome (2121022201212).

The spelling of 1000021001211 in words is "one trillion, twenty-one million, one thousand, two hundred eleven".