221646215121442 has 16 divisors (see below), whose sum is σ = 336762295435872. Its totient is φ = 109399436290080.

The previous prime is 221646215121439. The next prime is 221646215121481. The reversal of 221646215121442 is 244121512646122.

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, 1829851059 + ... + 1829972182.

It is an arithmetic number, because the mean of its divisors is an integer number (21047643464742).

Almost surely, 2^{221646215121442} is an apocalyptic number.

221646215121442 is a deficient number, since it is larger than the sum of its proper divisors (115116080314430).

221646215121442 is a wasteful number, since it uses less digits than its factorization.

221646215121442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3659823633.

The product of its digits is 368640, while the sum is 43.

Adding to 221646215121442 its reverse (244121512646122), we get a palindrome (465767727767564).

The spelling of 221646215121442 in words is "two hundred twenty-one trillion, six hundred forty-six billion, two hundred fifteen million, one hundred twenty-one thousand, four hundred forty-two".