21121311211602 has 16 divisors (see below), whose sum is σ = 48277282769472. Its totient is φ = 6034660346160.

The previous prime is 21121311211541. The next prime is 21121311211603. The reversal of 21121311211602 is 20611211312112.

It is a happy number.

It is a super-2 number, since 2×21121311211602² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121311211603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251444181049 + ... + 251444181132.

It is an arithmetic number, because the mean of its divisors is an integer number (3017330173092).

Almost surely, 2^{21121311211602} is an apocalyptic number.

21121311211602 is an abundant number, since it is smaller than the sum of its proper divisors (27155971557870).

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

21121311211602 is a wasteful number, since it uses less digits than its factorization.

21121311211602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502888362193.

The product of its (nonzero) digits is 288, while the sum is 24.

Adding to 21121311211602 its reverse (20611211312112), we get a palindrome (41732522523714).

The spelling of 21121311211602 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred eleven million, two hundred eleven thousand, six hundred two".