21010322120 has 16 divisors (see below), whose sum is σ = 47273224860. Its totient is φ = 8404128832.

The previous prime is 21010322111. The next prime is 21010322129. The reversal of 21010322120 is 2122301012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21010322111) and next prime (21010322129).

It can be written as a sum of positive squares in 2 ways, for example, as 19147363876 + 1862958244 = 138374^2 + 43162^2 .

It is a super-2 number, since 2×21010322120² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21010322095 and 21010322104.

It is not an unprimeable number, because it can be changed into a prime (21010322129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262628987 + ... + 262629066.

Almost surely, 2^21010322120 is an apocalyptic number.

21010322120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010322120 is an abundant number, since it is smaller than the sum of its proper divisors (26262902740).

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

21010322120 is a wasteful number, since it uses less digits than its factorization.

21010322120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525258064 (or 525258060 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21010322120 its reverse (2122301012), we get a palindrome (23132623132).

The spelling of 21010322120 in words is "twenty-one billion, ten million, three hundred twenty-two thousand, one hundred twenty".