21001022010002 has 8 divisors (see below), whose sum is σ = 31554655332156. Its totient is φ = 10482803565952.

The previous prime is 21001022009963. The next prime is 21001022010037. The reversal of 21001022010002 is 20001022010012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20987494226521 + 13527783481 = 4581211^2 + 116309^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 8853718043 + ... + 8853720414.

Almost surely, 2^{21001022010002} is an apocalyptic number.

21001022010002 is a deficient number, since it is larger than the sum of its proper divisors (10553633322154).

21001022010002 is a wasteful number, since it uses less digits than its factorization.

21001022010002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17707439052.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21001022010002 its reverse (20001022010012), we get a palindrome (41002044020014).

The spelling of 21001022010002 in words is "twenty-one trillion, one billion, twenty-two million, ten thousand, two".