21001020002200 has 48 divisors (see below), whose sum is σ = 55802710295280. Its totient is φ = 7200349714560.

The previous prime is 21001020002197. The next prime is 21001020002219. The reversal of 21001020002200 is 220002010012.

It is a super-2 number, since 2×21001020002200² (a number of 27 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7500362887 + ... + 7500365686.

It is an arithmetic number, because the mean of its divisors is an integer number (1162556464485).

Almost surely, 2^{21001020002200} is an apocalyptic number.

21001020002200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001020002200 is an abundant number, since it is smaller than the sum of its proper divisors (34801690293080).

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

21001020002200 is a wasteful number, since it uses less digits than its factorization.

21001020002200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15000728596 (or 15000728587 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21001020002200 its reverse (220002010012), we get a palindrome (21221022012212).

The spelling of 21001020002200 in words is "twenty-one trillion, one billion, twenty million, two thousand, two hundred".