21725033387 has 8 divisors (see below), whose sum is σ = 22678617600. Its totient is φ = 20772200680.

The previous prime is 21725033377. The next prime is 21725033437. The reversal of 21725033387 is 78333052712.

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

It is not a de Polignac number, because 21725033387 - 2¹⁴ = 21725017003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21725033347) 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, 128387 + ... + 244812.

It is an arithmetic number, because the mean of its divisors is an integer number (2834827200).

Almost surely, 2^21725033387 is an apocalyptic number.

21725033387 is a deficient number, since it is larger than the sum of its proper divisors (953584213).

21725033387 is a wasteful number, since it uses less digits than its factorization.

21725033387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375753.

The product of its (nonzero) digits is 211680, while the sum is 41.

The spelling of 21725033387 in words is "twenty-one billion, seven hundred twenty-five million, thirty-three thousand, three hundred eighty-seven".