2100021002010 has 80 divisors (see below), whose sum is σ = 5656510746216. Its totient is φ = 559034929152.

The previous prime is 2100021001963. The next prime is 2100021002029. The reversal of 2100021002010 is 102001200012.

It can be written as a sum of positive squares in 4 ways, for example, as 2039603853609 + 60417148401 = 1428147^2 + 245799^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 2100021001983 and 2100021002001.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1779267 + ... + 2714006.

Almost surely, 2^{2100021002010} is an apocalyptic number.

2100021002010 is an abundant number, since it is smaller than the sum of its proper divisors (3556489744206).

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

2100021002010 is a wasteful number, since it uses less digits than its factorization.

2100021002010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4493869 (or 4493860 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 2100021002010 its reverse (102001200012), we get a palindrome (2202022202022).

The spelling of 2100021002010 in words is "two trillion, one hundred billion, twenty-one million, two thousand, ten".