21221120212102 has 16 divisors (see below), whose sum is σ = 31838447440800. Its totient is φ = 10608304609728.

The previous prime is 21221120212093. The next prime is 21221120212111. The reversal of 21221120212102 is 20121202112212.

It is an interprime number because it is at equal distance from previous prime (21221120212093) and next prime (21221120212111).

It is a self number, because there is not a number n which added to its sum of digits gives 21221120212102.

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, 269781274 + ... + 269859922.

It is an arithmetic number, because the mean of its divisors is an integer number (1989902965050).

Almost surely, 2^{21221120212102} is an apocalyptic number.

21221120212102 is a deficient number, since it is larger than the sum of its proper divisors (10617327228698).

21221120212102 is a wasteful number, since it uses less digits than its factorization.

21221120212102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105615.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21221120212102 its reverse (20121202112212), we get a palindrome (41342322324314).

The spelling of 21221120212102 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty million, two hundred twelve thousand, one hundred two".