21131443110420 has 72 divisors (see below), whose sum is σ = 64099168092960. Its totient is φ = 5635011291840.

The previous prime is 21131443110397. The next prime is 21131443110439. The reversal of 21131443110420 is 2401134413112.

It is a happy number.

21131443110420 is a `hidden beast` number, since 2 + 11 + 314 + 4 + 311 + 0 + 4 + 20 = 666.

It is a super-3 number, since 3×21131443110420³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31706415 + ... + 32366025.

Almost surely, 2^{21131443110420} is an apocalyptic number.

21131443110420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21131443110420 is an abundant number, since it is smaller than the sum of its proper divisors (42967724982540).

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

21131443110420 is a wasteful number, since it uses less digits than its factorization.

21131443110420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837605 (or 837600 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

Adding to 21131443110420 its reverse (2401134413112), we get a palindrome (23532577523532).

The spelling of 21131443110420 in words is "twenty-one trillion, one hundred thirty-one billion, four hundred forty-three million, one hundred ten thousand, four hundred twenty".