21001011212002 has 8 divisors (see below), whose sum is σ = 33354547219116. Its totient is φ = 9882828805632.

The previous prime is 21001011211967. The next prime is 21001011212021. The reversal of 21001011212002 is 20021211010012.

It can be written as a sum of positive squares in 2 ways, for example, as 15903896744961 + 5097114467041 = 3987969^2 + 2257679^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308838400143 + ... + 308838400210.

Almost surely, 2^{21001011212002} is an apocalyptic number.

21001011212002 is a deficient number, since it is larger than the sum of its proper divisors (12353536007114).

21001011212002 is a wasteful number, since it uses less digits than its factorization.

21001011212002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617676800372.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21001011212002 its reverse (20021211010012), we get a palindrome (41022222222014).

The spelling of 21001011212002 in words is "twenty-one trillion, one billion, eleven million, two hundred twelve thousand, two".