21001001011002 has 96 divisors (see below), whose sum is σ = 46718149757760. Its totient is φ = 6815574432000.

The previous prime is 21001001010967. The next prime is 21001001011043. The reversal of 21001001011002 is 20011010010012.

It is a happy number.

It is a super-2 number, since 2×21001001011002² (a number of 27 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 471899752 + ... + 471944252.

It is an arithmetic number, because the mean of its divisors is an integer number (486647393310).

Almost surely, 2^{21001001011002} is an apocalyptic number.

21001001011002 is an abundant number, since it is smaller than the sum of its proper divisors (25717148746758).

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

21001001011002 is a wasteful number, since it uses less digits than its factorization.

21001001011002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48828 (or 48825 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21001001011002 its reverse (20011010010012), we get a palindrome (41012011021014).

The spelling of 21001001011002 in words is "twenty-one trillion, one billion, one million, eleven thousand, two".