21154533213542 has 8 divisors (see below), whose sum is σ = 31732370610600. Its totient is φ = 10577076343344.

The previous prime is 21154533213529. The next prime is 21154533213547. The reversal of 21154533213542 is 24531233545112.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21154533213542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154533213547) 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, 94992692 + ... + 95215127.

It is an arithmetic number, because the mean of its divisors is an integer number (3966546326325).

Almost surely, 2^{21154533213542} is an apocalyptic number.

21154533213542 is a deficient number, since it is larger than the sum of its proper divisors (10577837397058).

21154533213542 is a wasteful number, since it uses less digits than its factorization.

21154533213542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190263430.

The product of its digits is 432000, while the sum is 41.

Adding to 21154533213542 its reverse (24531233545112), we get a palindrome (45685766758654).

The spelling of 21154533213542 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred thirty-three million, two hundred thirteen thousand, five hundred forty-two".