10001001220021 has 8 divisors (see below), whose sum is σ = 12102051896640. Its totient is φ = 8068034597568.

The previous prime is 10001001219983. The next prime is 10001001220033. The reversal of 10001001220021 is 12002210010001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10001001220021 - 2¹⁹ = 10001000695733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001001220921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42021013411 + ... + 42021013648.

It is an arithmetic number, because the mean of its divisors is an integer number (1512756487080).

Almost surely, 2^{10001001220021} is an apocalyptic number.

It is an amenable number.

10001001220021 is a deficient number, since it is larger than the sum of its proper divisors (2101050676619).

10001001220021 is an equidigital number, since it uses as much as digits as its factorization.

10001001220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84042027083.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 10001001220021 its reverse (12002210010001), we get a palindrome (22003211230022).

The spelling of 10001001220021 in words is "ten trillion, one billion, one million, two hundred twenty thousand, twenty-one".