21001201001010 has 48 divisors (see below), whose sum is σ = 54820664982720. Its totient is φ = 5578008228000.

The previous prime is 21001201001009. The next prime is 21001201001057. The reversal of 21001201001010 is 1010010210012.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21001201000983 and 21001201001001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 464811430 + ... + 464856609.

It is an arithmetic number, because the mean of its divisors is an integer number (1142097187140).

Almost surely, 2^{21001201001010} is an apocalyptic number.

21001201001010 is an abundant number, since it is smaller than the sum of its proper divisors (33819463981710).

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

21001201001010 is a wasteful number, since it uses less digits than its factorization.

21001201001010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929668303 (or 929668300 counting only the distinct ones).

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

Adding to 21001201001010 its reverse (1010010210012), we get a palindrome (22011211211022).

The spelling of 21001201001010 in words is "twenty-one trillion, one billion, two hundred one million, one thousand, ten".