210001121020 has 48 divisors (see below), whose sum is σ = 468809258400. Its totient is φ = 78791443200.

The previous prime is 210001120991. The next prime is 210001121089. The reversal of 210001121020 is 20121100012.

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 = 210001120988 and 210001121006.

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, 2697435 + ... + 2774194.

It is an arithmetic number, because the mean of its divisors is an integer number (9766859550).

Almost surely, 2^210001121020 is an apocalyptic number.

210001121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210001121020 is an abundant number, since it is smaller than the sum of its proper divisors (258808137380).

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

210001121020 is a wasteful number, since it uses less digits than its factorization.

210001121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5471758 (or 5471756 counting only the distinct ones).

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

Adding to 210001121020 its reverse (20121100012), we get a palindrome (230122221032).

The spelling of 210001121020 in words is "two hundred ten billion, one million, one hundred twenty-one thousand, twenty".