21002011000002 has 24 divisors (see below), whose sum is σ = 45504784254384. Its totient is φ = 7000604627544.

The previous prime is 21002010999973. The next prime is 21002011000007. The reversal of 21002011000002 is 20000011020012.

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

It is not an unprimeable number, because it can be changed into a prime (21002011000007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3484828 + ... + 7358535.

It is an arithmetic number, because the mean of its divisors is an integer number (1896032677266).

Almost surely, 2^{21002011000002} is an apocalyptic number.

21002011000002 is an abundant number, since it is smaller than the sum of its proper divisors (24502773254382).

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

21002011000002 is a wasteful number, since it uses less digits than its factorization.

21002011000002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10950974 (or 10950971 counting only the distinct ones).

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

Adding to 21002011000002 its reverse (20000011020012), we get a palindrome (41002022020014).

The spelling of 21002011000002 in words is "twenty-one trillion, two billion, eleven million, two", and thus it is an aban number and an uban number.