21221111001010 has 16 divisors (see below), whose sum is σ = 38202848020800. Its totient is φ = 8487367018416.

The previous prime is 21221111001007. The next prime is 21221111001029. The reversal of 21221111001010 is 1010011112212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134590020 + ... + 134747599.

It is an arithmetic number, because the mean of its divisors is an integer number (2387678001300).

Almost surely, 2^{21221111001010} is an apocalyptic number.

21221111001010 is a deficient number, since it is larger than the sum of its proper divisors (16981737019790).

21221111001010 is a wasteful number, since it uses less digits than its factorization.

21221111001010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269345505.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21221111001010 its reverse (1010011112212), we get a palindrome (22231122113222).

The spelling of 21221111001010 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, one thousand, ten".