21154510222043 has 8 divisors (see below), whose sum is σ = 23614336992576. Its totient is φ = 18784131697800.

The previous prime is 21154510222031. The next prime is 21154510222061. The reversal of 21154510222043 is 34022201545112.

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

It is a cyclic number.

It is not a de Polignac number, because 21154510222043 - 2¹⁴ = 21154510205659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21154510222243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22362061073 + ... + 22362062018.

It is an arithmetic number, because the mean of its divisors is an integer number (2951792124072).

Almost surely, 2^{21154510222043} is an apocalyptic number.

21154510222043 is a deficient number, since it is larger than the sum of its proper divisors (2459826770533).

21154510222043 is a wasteful number, since it uses less digits than its factorization.

21154510222043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44724123145.

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 21154510222043 its reverse (34022201545112), we get a palindrome (55176711767155).

The spelling of 21154510222043 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred ten million, two hundred twenty-two thousand, forty-three".