21201121222102 has 32 divisors (see below), whose sum is σ = 32889567359232. Its totient is φ = 10243995082464.

The previous prime is 21201121222093. The next prime is 21201121222111. The reversal of 21201121222102 is 20122212110212.

It is an interprime number because it is at equal distance from previous prime (21201121222093) and next prime (21201121222111).

It is a self number, because there is not a number n which added to its sum of digits gives 21201121222102.

It is a congruent 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, 55966743 + ... + 56344285.

It is an arithmetic number, because the mean of its divisors is an integer number (1027798979976).

Almost surely, 2^{21201121222102} is an apocalyptic number.

21201121222102 is a deficient number, since it is larger than the sum of its proper divisors (11688446137130).

21201121222102 is a wasteful number, since it uses less digits than its factorization.

21201121222102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385572.

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

Adding to 21201121222102 its reverse (20122212110212), we get a palindrome (41323333332314).

The spelling of 21201121222102 in words is "twenty-one trillion, two hundred one billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred two".