21121222021102 has 32 divisors (see below), whose sum is σ = 36272089857024. Its totient is φ = 9035888320800.

The previous prime is 21121222021079. The next prime is 21121222021147. The reversal of 21121222021102 is 20112022212112.

It is a super-2 number, since 2×21121222021102² (a number of 27 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 21121222021102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41072652 + ... + 41583712.

It is an arithmetic number, because the mean of its divisors is an integer number (1133502808032).

Almost surely, 2^{21121222021102} is an apocalyptic number.

21121222021102 is a deficient number, since it is larger than the sum of its proper divisors (15150867835922).

21121222021102 is a wasteful number, since it uses less digits than its factorization.

21121222021102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516304.

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

Adding to 21121222021102 its reverse (20112022212112), we get a palindrome (41233244233214).

The spelling of 21121222021102 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty-two million, twenty-one thousand, one hundred two".