21825872974 has 4 divisors (see below), whose sum is σ = 32738809464. Its totient is φ = 10912936486.

The previous prime is 21825872951. The next prime is 21825873001. The reversal of 21825872974 is 47927852812.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5456468242 + ... + 5456468245.

It is an arithmetic number, because the mean of its divisors is an integer number (8184702366).

Almost surely, 2^21825872974 is an apocalyptic number.

21825872974 is a deficient number, since it is larger than the sum of its proper divisors (10912936490).

21825872974 is a wasteful number, since it uses less digits than its factorization.

21825872974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10912936489.

The product of its digits is 4515840, while the sum is 55.

The spelling of 21825872974 in words is "twenty-one billion, eight hundred twenty-five million, eight hundred seventy-two thousand, nine hundred seventy-four".