20020001001021 has 48 divisors (see below), whose sum is σ = 33082034364288. Its totient is φ = 11428531920000.

The previous prime is 20020001001017. The next prime is 20020001001031. The reversal of 20020001001021 is 12010010002002.

It is not a de Polignac number, because 20020001001021 - 2² = 20020001001017 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 = 20020001000994 and 20020001001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020001001031) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 381183655 + ... + 381236171.

It is an arithmetic number, because the mean of its divisors is an integer number (689209049256).

Almost surely, 2^{20020001001021} is an apocalyptic number.

20020001001021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20020001001021 is a deficient number, since it is larger than the sum of its proper divisors (13062033363267).

20020001001021 is a wasteful number, since it uses less digits than its factorization.

20020001001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58482 (or 58479 counting only the distinct ones).

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

Adding to 20020001001021 its reverse (12010010002002), we get a palindrome (32030011003023).

The spelling of 20020001001021 in words is "twenty trillion, twenty billion, one million, one thousand, twenty-one".