21221121021102 has 32 divisors (see below), whose sum is σ = 47232782204160. Its totient is φ = 7062496683480.

The previous prime is 21221121021053. The next prime is 21221121021127. The reversal of 21221121021102 is 20112012112212.

21221121021102 is a `hidden beast` number, since 21 + 221 + 1 + 210 + 211 + 0 + 2 = 666.

It is a super-3 number, since 3×21221121021102³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 311363488 + ... + 311431635.

It is an arithmetic number, because the mean of its divisors is an integer number (1476024443880).

Almost surely, 2^{21221121021102} is an apocalyptic number.

21221121021102 is an abundant number, since it is smaller than the sum of its proper divisors (26011661183058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221121021102 is a wasteful number, since it uses less digits than its factorization.

21221121021102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622795765 (or 622795759 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21221121021102 its reverse (20112012112212), we get a palindrome (41333133133314).

The spelling of 21221121021102 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-one million, twenty-one thousand, one hundred two".