21146542003231 has 4 divisors (see below), whose sum is σ = 21146655224464. Its totient is φ = 21146428782000.

The previous prime is 21146542003229. The next prime is 21146542003243. The reversal of 21146542003231 is 13230024564112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21146542003231 - 2¹ = 21146542003229 is a prime.

It is a super-2 number, since 2×21146542003231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21146542003201) 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, 56329995 + ... + 56704156.

It is an arithmetic number, because the mean of its divisors is an integer number (5286663806116).

Almost surely, 2^{21146542003231} is an apocalyptic number.

21146542003231 is a deficient number, since it is larger than the sum of its proper divisors (113221233).

21146542003231 is a wasteful number, since it uses less digits than its factorization.

21146542003231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113221232.

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 21146542003231 its reverse (13230024564112), we get a palindrome (34376566567343).

The spelling of 21146542003231 in words is "twenty-one trillion, one hundred forty-six billion, five hundred forty-two million, three thousand, two hundred thirty-one".