21201123031230 has 64 divisors (see below), whose sum is σ = 53898831717120. Its totient is φ = 5318790941184.

The previous prime is 21201123031223. The next prime is 21201123031237. The reversal of 21201123031230 is 3213032110212.

It is an interprime number because it is at equal distance from previous prime (21201123031223) and next prime (21201123031237).

It is a super-2 number, since 2×21201123031230² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21201123031197 and 21201123031206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201123031237) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7693564 + ... + 10079343.

It is an arithmetic number, because the mean of its divisors is an integer number (842169245580).

Almost surely, 2^{21201123031230} is an apocalyptic number.

21201123031230 is an abundant number, since it is smaller than the sum of its proper divisors (32697708685890).

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

21201123031230 is a wasteful number, since it uses less digits than its factorization.

21201123031230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17775273.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21201123031230 its reverse (3213032110212), we get a palindrome (24414155141442).

The spelling of 21201123031230 in words is "twenty-one trillion, two hundred one billion, one hundred twenty-three million, thirty-one thousand, two hundred thirty".