20010002021 has 8 divisors (see below), whose sum is σ = 20100809664. Its totient is φ = 19919236960.

The previous prime is 20010002009. The next prime is 20010002027. The reversal of 20010002021 is 12020001002.

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 20010002021 - 2¹⁴ = 20009985637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010002027) 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, 1280960 + ... + 1296486.

It is an arithmetic number, because the mean of its divisors is an integer number (2512601208).

Almost surely, 2^20010002021 is an apocalyptic number.

It is an amenable number.

20010002021 is a deficient number, since it is larger than the sum of its proper divisors (90807643).

20010002021 is a wasteful number, since it uses less digits than its factorization.

20010002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21291.

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

Adding to 20010002021 its reverse (12020001002), we get a palindrome (32030003023).

The spelling of 20010002021 in words is "twenty billion, ten million, two thousand, twenty-one".