20100021001 has 8 divisors (see below), whose sum is σ = 20433049344. Its totient is φ = 19767106320.

The previous prime is 20100020999. The next prime is 20100021013. The reversal of 20100021001 is 10012000102.

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 20100021001 - 2¹ = 20100020999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20100021041) 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, 375240 + ... + 425446.

It is an arithmetic number, because the mean of its divisors is an integer number (2554131168).

Almost surely, 2^20100021001 is an apocalyptic number.

It is an amenable number.

20100021001 is a deficient number, since it is larger than the sum of its proper divisors (333028343).

20100021001 is an equidigital number, since it uses as much as digits as its factorization.

20100021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56831.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 20100021001 its reverse (10012000102), we get a palindrome (30112021103).

The spelling of 20100021001 in words is "twenty billion, one hundred million, twenty-one thousand, one".