20020101021 has 12 divisors (see below), whose sum is σ = 29988958272. Its totient is φ = 13346733852.

The previous prime is 20020101001. The next prime is 20020101029. The reversal of 20020101021 is 12010102002.

It is not a de Polignac number, because 20020101021 - 2⁶ = 20020100957 is a prime.

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 = 20020100994 and 20020101012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020101029) 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, 41193381 + ... + 41193866.

It is an arithmetic number, because the mean of its divisors is an integer number (2499079856).

Almost surely, 2^20020101021 is an apocalyptic number.

It is an amenable number.

20020101021 is a deficient number, since it is larger than the sum of its proper divisors (9968857251).

20020101021 is an frugal number, since it uses more digits than its factorization.

20020101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82387262 (or 82387250 counting only the distinct ones).

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

Adding to 20020101021 its reverse (12010102002), we get a palindrome (32030203023).

The spelling of 20020101021 in words is "twenty billion, twenty million, one hundred one thousand, twenty-one".