2001022101020 has 48 divisors (see below), whose sum is σ = 4227153285600. Its totient is φ = 795647198976.

The previous prime is 2001022101011. The next prime is 2001022101041. The reversal of 2001022101020 is 201012201002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2001022100992 and 2001022101010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21748634 + ... + 21840446.

It is an arithmetic number, because the mean of its divisors is an integer number (88065693450).

Almost surely, 2^{2001022101020} is an apocalyptic number.

2001022101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001022101020 is an abundant number, since it is smaller than the sum of its proper divisors (2226131184580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2001022101020 is a wasteful number, since it uses less digits than its factorization.

2001022101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98294 (or 98292 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2001022101020 its reverse (201012201002), we get a palindrome (2202034302022).

The spelling of 2001022101020 in words is "two trillion, one billion, twenty-two million, one hundred one thousand, twenty".