1020121001020 has 48 divisors (see below), whose sum is σ = 2342074131936. Its totient is φ = 370148384000.

The previous prime is 1020121000949. The next prime is 1020121001027. The reversal of 1020121001020 is 201001210201.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1020121000988 and 1020121001006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020121001027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4927771 + ... + 5130610.

It is an arithmetic number, because the mean of its divisors is an integer number (48793211082).

Almost surely, 2^{1020121001020} is an apocalyptic number.

1020121001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020121001020 is an abundant number, since it is smaller than the sum of its proper divisors (1321953130916).

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

1020121001020 is a wasteful number, since it uses less digits than its factorization.

1020121001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10058862 (or 10058860 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1020121001020 its reverse (201001210201), we get a palindrome (1221122211221).

The spelling of 1020121001020 in words is "one trillion, twenty billion, one hundred twenty-one million, one thousand, twenty".