21020100001 has 8 divisors (see below), whose sum is σ = 21070434560. Its totient is φ = 20969795808.

The previous prime is 21020099987. The next prime is 21020100043. The reversal of 21020100001 is 10000102012.

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 21020100001 - 2⁷ = 21020099873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020100061) 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, 1970440 + ... + 1981078.

It is an arithmetic number, because the mean of its divisors is an integer number (2633804320).

Almost surely, 2^21020100001 is an apocalyptic number.

It is an amenable number.

21020100001 is a deficient number, since it is larger than the sum of its proper divisors (50334559).

21020100001 is a wasteful number, since it uses less digits than its factorization.

21020100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15183.

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

Adding to 21020100001 its reverse (10000102012), we get a palindrome (31020202013).

The spelling of 21020100001 in words is "twenty-one billion, twenty million, one hundred thousand, one".