20000021001 has 8 divisors (see below), whose sum is σ = 26684118624. Its totient is φ = 13324635360.

The previous prime is 20000020973. The next prime is 20000021003. The reversal of 20000021001 is 10012000002.

It is a happy number.

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

It is not a de Polignac number, because 20000021001 - 2⁹ = 20000020489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20000021003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2172636 + ... + 2181821.

It is an arithmetic number, because the mean of its divisors is an integer number (3335514828).

Almost surely, 2^20000021001 is an apocalyptic number.

It is an amenable number.

20000021001 is a deficient number, since it is larger than the sum of its proper divisors (6684097623).

20000021001 is a wasteful number, since it uses less digits than its factorization.

20000021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4355991.

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 20000021001 its reverse (10012000002), we get a palindrome (30012021003).

It can be divided in two parts, 2000002 and 1001, that multiplied together give a palindrome (2002002002).

The spelling of 20000021001 in words is "twenty billion, twenty-one thousand, one".