21115321351102 has 16 divisors (see below), whose sum is σ = 34556145076224. Its totient is φ = 9596817495000.

The previous prime is 21115321351049. The next prime is 21115321351109. The reversal of 21115321351102 is 20115312351112.

It is a happy number.

It is a super-2 number, since 2×21115321351102² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115321351109) 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, 52587774 + ... + 52987777.

It is an arithmetic number, because the mean of its divisors is an integer number (2159759067264).

Almost surely, 2^{21115321351102} is an apocalyptic number.

21115321351102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21115321351102 is a deficient number, since it is larger than the sum of its proper divisors (13440823725122).

21115321351102 is a wasteful number, since it uses less digits than its factorization.

21115321351102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105584655.

The product of its (nonzero) digits is 1800, while the sum is 28.

The spelling of 21115321351102 in words is "twenty-one trillion, one hundred fifteen billion, three hundred twenty-one million, three hundred fifty-one thousand, one hundred two".