21001010002 has 8 divisors (see below), whose sum is σ = 36001731456. Its totient is φ = 9000432852.

The previous prime is 21001009999. The next prime is 21001010029. The reversal of 21001010002 is 20001010012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21001010002² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 750036058 + ... + 750036085.

It is an arithmetic number, because the mean of its divisors is an integer number (4500216432).

Almost surely, 2^21001010002 is an apocalyptic number.

21001010002 is a deficient number, since it is larger than the sum of its proper divisors (15000721454).

21001010002 is a wasteful number, since it uses less digits than its factorization.

21001010002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500072152.

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

Adding to 21001010002 its reverse (20001010012), we get a palindrome (41002020014).

The spelling of 21001010002 in words is "twenty-one billion, one million, ten thousand, two".