20010201000021 has 12 divisors (see below), whose sum is σ = 28922601771648. Its totient is φ = 13331374874664.

The previous prime is 20010201000011. The next prime is 20010201000029. The reversal of 20010201000021 is 12000010201002.

It is not a de Polignac number, because 20010201000021 - 2¹⁷ = 20010200868949 is a prime.

It is a super-2 number, since 2×20010201000021² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20010200999967 and 20010201000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010201000029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 729912645 + ... + 729940058.

It is an arithmetic number, because the mean of its divisors is an integer number (2410216814304).

Almost surely, 2^{20010201000021} is an apocalyptic number.

It is an amenable number.

20010201000021 is a deficient number, since it is larger than the sum of its proper divisors (8912400771627).

20010201000021 is a wasteful number, since it uses less digits than its factorization.

20010201000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459854232 (or 1459854229 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20010201000021 its reverse (12000010201002), we get a palindrome (32010211201023).

The spelling of 20010201000021 in words is "twenty trillion, ten billion, two hundred one million, twenty-one", and thus it is an aban number.