21000011101002 has 64 divisors (see below), whose sum is σ = 49146085968000. Its totient is φ = 6628443300864.

The previous prime is 21000011100997. The next prime is 21000011101051. The reversal of 21000011101002 is 20010111000012.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 2675377 + ... + 7011252.

It is an arithmetic number, because the mean of its divisors is an integer number (767907593250).

Almost surely, 2^{21000011101002} is an apocalyptic number.

21000011101002 is an abundant number, since it is smaller than the sum of its proper divisors (28146074866998).

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

21000011101002 is a wasteful number, since it uses less digits than its factorization.

21000011101002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9688772 (or 9688766 counting only the distinct ones).

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

Adding to 21000011101002 its reverse (20010111000012), we get a palindrome (41010122101014).

The spelling of 21000011101002 in words is "twenty-one trillion, eleven million, one hundred one thousand, two".