2001022121020 has 36 divisors (see below), whose sum is σ = 4550253268680. Its totient is φ = 738838935744.

The previous prime is 2001022120969. The next prime is 2001022121071. The reversal of 2001022121020 is 201212201002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2001022120969) and next prime (2001022121071).

It is a super-2 number, since 2×2001022121020² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 296005810 + ... + 296012569.

It is an arithmetic number, because the mean of its divisors is an integer number (126395924130).

Almost surely, 2^{2001022121020} is an apocalyptic number.

2001022121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001022121020 is an abundant number, since it is smaller than the sum of its proper divisors (2549231147660).

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

2001022121020 is a wasteful number, since it uses less digits than its factorization.

2001022121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592018414 (or 592018399 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2001022121020 its reverse (201212201002), we get a palindrome (2202234322022).

The spelling of 2001022121020 in words is "two trillion, one billion, twenty-two million, one hundred twenty-one thousand, twenty".