221221202020102 has 16 divisors (see below), whose sum is σ = 343629267996960. Its totient is φ = 106686001332288.

The previous prime is 221221202020009. The next prime is 221221202020123. The reversal of 221221202020102 is 201020202122122.

It is a super-2 number, since 2×221221202020102² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221221202020102.

It is a congruent 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, 1972104543 + ... + 1972216714.

It is an arithmetic number, because the mean of its divisors is an integer number (21476829249810).

Almost surely, 2^{221221202020102} is an apocalyptic number.

221221202020102 is a deficient number, since it is larger than the sum of its proper divisors (122408065976858).

221221202020102 is a wasteful number, since it uses less digits than its factorization.

221221202020102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3944322255.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221221202020102 its reverse (201020202122122), we get a palindrome (422241404142224).

The spelling of 221221202020102 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two hundred two million, twenty thousand, one hundred two".