21001020000002 has 48 divisors (see below), whose sum is σ = 37432499424768. Its totient is φ = 8807010871680.

The previous prime is 21001019999987. The next prime is 21001020000017. The reversal of 21001020000002 is 20000002010012.

It is an interprime number because it is at equal distance from previous prime (21001019999987) and next prime (21001020000017).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20649578 + ... + 21642714.

It is an arithmetic number, because the mean of its divisors is an integer number (779843738016).

Almost surely, 2^{21001020000002} is an apocalyptic number.

21001020000002 is a deficient number, since it is larger than the sum of its proper divisors (16431479424766).

21001020000002 is a wasteful number, since it uses less digits than its factorization.

21001020000002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997791 (or 997784 counting only the distinct ones).

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

Adding to 21001020000002 its reverse (20000002010012), we get a palindrome (41001022010014).

The spelling of 21001020000002 in words is "twenty-one trillion, one billion, twenty million, two", and thus it is an aban number and an uban number.