10001121020 has 48 divisors (see below), whose sum is σ = 22921260768. Its totient is φ = 3635247360.

The previous prime is 10001121019. The next prime is 10001121059. The reversal of 10001121020 is 2012110001.

It is a junction number, because it is equal to n+sod(n) for n = 10001120989 and 10001121007.

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, 607214 + ... + 623466.

It is an arithmetic number, because the mean of its divisors is an integer number (477526266).

Almost surely, 2^10001121020 is an apocalyptic number.

10001121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10001121020 is an abundant number, since it is smaller than the sum of its proper divisors (12920139748).

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

10001121020 is a wasteful number, since it uses less digits than its factorization.

10001121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19070 (or 19068 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 10001121020 its reverse (2012110001), we get a palindrome (12013231021).

The spelling of 10001121020 in words is "ten billion, one million, one hundred twenty-one thousand, twenty".