210001001020 has 24 divisors (see below), whose sum is σ = 466943403024. Its totient is φ = 79059200256.

The previous prime is 210001000943. The next prime is 210001001039. The reversal of 210001001020 is 20100100012.

It is a junction number, because it is equal to n+sod(n) for n = 210001000994 and 210001001012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308824662 + ... + 308825341.

It is an arithmetic number, because the mean of its divisors is an integer number (19455975126).

Almost surely, 2^210001001020 is an apocalyptic number.

210001001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210001001020 is an abundant number, since it is smaller than the sum of its proper divisors (256942402004).

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

210001001020 is a wasteful number, since it uses less digits than its factorization.

210001001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617650029 (or 617650027 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 210001001020 its reverse (20100100012), we get a palindrome (230101101032).

The spelling of 210001001020 in words is "two hundred ten billion, one million, one thousand, twenty".