1000021120101 has 16 divisors (see below), whose sum is σ = 1495104635200. Its totient is φ = 660564407664.

The previous prime is 1000021120097. The next prime is 1000021120103. The reversal of 1000021120101 is 1010211200001.

It is a happy number.

It is not a de Polignac number, because 1000021120101 - 2² = 1000021120097 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000021120103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169895311 + ... + 169901196.

It is an arithmetic number, because the mean of its divisors is an integer number (93444039700).

Almost surely, 2^{1000021120101} is an apocalyptic number.

It is an amenable number.

1000021120101 is a deficient number, since it is larger than the sum of its proper divisors (495083515099).

1000021120101 is a wasteful number, since it uses less digits than its factorization.

1000021120101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339796625 (or 339796619 counting only the distinct ones).

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

Adding to 1000021120101 its reverse (1010211200001), we get a palindrome (2010232320102).

The spelling of 1000021120101 in words is "one trillion, twenty-one million, one hundred twenty thousand, one hundred one".