21223332542120 has 16 divisors (see below), whose sum is σ = 47752498219860. Its totient is φ = 8489333016832.

The previous prime is 21223332542099. The next prime is 21223332542173. The reversal of 21223332542120 is 2124523332212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20043940886116 + 1179391656004 = 4477046^2 + 1085998^2 .

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, 265291656737 + ... + 265291656816.

Almost surely, 2^{21223332542120} is an apocalyptic number.

21223332542120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21223332542120 is an abundant number, since it is smaller than the sum of its proper divisors (26529165677740).

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

21223332542120 is a wasteful number, since it uses less digits than its factorization.

21223332542120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530583313564 (or 530583313560 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 32.

Adding to 21223332542120 its reverse (2124523332212), we get a palindrome (23347855874332).

The spelling of 21223332542120 in words is "twenty-one trillion, two hundred twenty-three billion, three hundred thirty-two million, five hundred forty-two thousand, one hundred twenty".