21323210121020 has 12 divisors (see below), whose sum is σ = 44778741254184. Its totient is φ = 8529284048400.

The previous prime is 21323210121007. The next prime is 21323210121041. The reversal of 21323210121020 is 2012101232312.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1066160506051 = 21323210121020 / (2 + 1 + 3 + 2 + 3 + 2 + 1 + 0 + 1 + 2 + 1 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 21323210120983 and 21323210121001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533080253006 + ... + 533080253045.

It is an arithmetic number, because the mean of its divisors is an integer number (3731561771182).

Almost surely, 2^{21323210121020} is an apocalyptic number.

21323210121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21323210121020 is an abundant number, since it is smaller than the sum of its proper divisors (23455531133164).

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

21323210121020 is a wasteful number, since it uses less digits than its factorization.

21323210121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066160506060 (or 1066160506058 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21323210121020 its reverse (2012101232312), we get a palindrome (23335311353332).

The spelling of 21323210121020 in words is "twenty-one trillion, three hundred twenty-three billion, two hundred ten million, one hundred twenty-one thousand, twenty".