21783532154 has 8 divisors (see below), whose sum is σ = 32812015680. Its totient is φ = 10846193596.

The previous prime is 21783532103. The next prime is 21783532157. The reversal of 21783532154 is 45123538712.

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

It is not an unprimeable number, because it can be changed into a prime (21783532157) 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, 22785644 + ... + 22786599.

It is an arithmetic number, because the mean of its divisors is an integer number (4101501960).

Almost surely, 2^21783532154 is an apocalyptic number.

21783532154 is a deficient number, since it is larger than the sum of its proper divisors (11028483526).

21783532154 is a wasteful number, since it uses less digits than its factorization.

21783532154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45572484.

The product of its digits is 201600, while the sum is 41.

The spelling of 21783532154 in words is "twenty-one billion, seven hundred eighty-three million, five hundred thirty-two thousand, one hundred fifty-four".