21001001101010 has 32 divisors (see below), whose sum is σ = 43204246715520. Its totient is φ = 7199978683392.

The previous prime is 21001001100979. The next prime is 21001001101063. The reversal of 21001001101010 is 1010110010012.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6200540 + ... + 8969319.

It is an arithmetic number, because the mean of its divisors is an integer number (1350132709860).

Almost surely, 2^{21001001101010} is an apocalyptic number.

21001001101010 is an abundant number, since it is smaller than the sum of its proper divisors (22203245614510).

21001001101010 is a wasteful number, since it uses less digits than its factorization.

21001001101010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15189650.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 21001001101010 its reverse (1010110010012), we get a palindrome (22011111111022).

The spelling of 21001001101010 in words is "twenty-one trillion, one billion, one million, one hundred one thousand, ten".