221021212012 has 48 divisors (see below), whose sum is σ = 392828405760. Its totient is φ = 108797755392.

The previous prime is 221021212001. The next prime is 221021212021. The reversal of 221021212012 is 210212120122.

It is a happy 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, 127535898 + ... + 127537630.

It is an arithmetic number, because the mean of its divisors is an integer number (8183925120).

Almost surely, 2^221021212012 is an apocalyptic number.

It is an amenable number.

221021212012 is a deficient number, since it is larger than the sum of its proper divisors (171807193748).

221021212012 is a wasteful number, since it uses less digits than its factorization.

221021212012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3370 (or 3368 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221021212012 its reverse (210212120122), we get a palindrome (431233332134).

It can be divided in two parts, 2 and 21021212012, that multiplied together give a palindrome (42042424024).

The spelling of 221021212012 in words is "two hundred twenty-one billion, twenty-one million, two hundred twelve thousand, twelve".