21230134623542 has 8 divisors (see below), whose sum is σ = 34294832853456. Its totient is φ = 9798523672392.

The previous prime is 21230134623487. The next prime is 21230134623571. The reversal of 21230134623542 is 24532643103212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21230134623542² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21230134623496 and 21230134623505.

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, 408271819658 + ... + 408271819709.

It is an arithmetic number, because the mean of its divisors is an integer number (4286854106682).

Almost surely, 2^{21230134623542} is an apocalyptic number.

21230134623542 is a deficient number, since it is larger than the sum of its proper divisors (13064698229914).

21230134623542 is a wasteful number, since it uses less digits than its factorization.

21230134623542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816543639382.

The product of its (nonzero) digits is 207360, while the sum is 38.

Adding to 21230134623542 its reverse (24532643103212), we get a palindrome (45762777726754).

The spelling of 21230134623542 in words is "twenty-one trillion, two hundred thirty billion, one hundred thirty-four million, six hundred twenty-three thousand, five hundred forty-two".