221020121002 has 24 divisors (see below), whose sum is σ = 346611931776. Its totient is φ = 105643371288.

The previous prime is 221020120999. The next prime is 221020121011. The reversal of 221020121002 is 200121020122.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 391738 + ... + 771685.

It is an arithmetic number, because the mean of its divisors is an integer number (14442163824).

Almost surely, 2^221020121002 is an apocalyptic number.

221020121002 is a deficient number, since it is larger than the sum of its proper divisors (125591810774).

221020121002 is a wasteful number, since it uses less digits than its factorization.

221020121002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163562 (or 1163515 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221020121002 its reverse (200121020122), we get a palindrome (421141141124).

The spelling of 221020121002 in words is "two hundred twenty-one billion, twenty million, one hundred twenty-one thousand, two".