21120212102120 has 32 divisors (see below), whose sum is σ = 47675267085600. Its totient is φ = 8420566644288.

The previous prime is 21120212102117. The next prime is 21120212102123. The reversal of 21120212102120 is 2120121202112.

It is an interprime number because it is at equal distance from previous prime (21120212102117) and next prime (21120212102123).

It is a super-2 number, since 2×21120212102120² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21120212102123) 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, 859931210 + ... + 859955769.

It is an arithmetic number, because the mean of its divisors is an integer number (1489852096425).

Almost surely, 2^{21120212102120} is an apocalyptic number.

21120212102120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120212102120 is an abundant number, since it is smaller than the sum of its proper divisors (26555054983480).

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

21120212102120 is a wasteful number, since it uses less digits than its factorization.

21120212102120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1719887297 (or 1719887293 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21120212102120 its reverse (2120121202112), we get a palindrome (23240333304232).

The spelling of 21120212102120 in words is "twenty-one trillion, one hundred twenty billion, two hundred twelve million, one hundred two thousand, one hundred twenty".