21542067974 has 8 divisors (see below), whose sum is σ = 36929259408. Its totient is φ = 9232314840.

The previous prime is 21542067949. The next prime is 21542067983. The reversal of 21542067974 is 47976024512.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 769359557 + ... + 769359584.

It is an arithmetic number, because the mean of its divisors is an integer number (4616157426).

Almost surely, 2^21542067974 is an apocalyptic number.

21542067974 is a deficient number, since it is larger than the sum of its proper divisors (15387191434).

21542067974 is a wasteful number, since it uses less digits than its factorization.

21542067974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538719150.

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 21542067974 in words is "twenty-one billion, five hundred forty-two million, sixty-seven thousand, nine hundred seventy-four".