21503701241 has 8 divisors (see below), whose sum is σ = 23470318944. Its totient is φ = 19539039520.

The previous prime is 21503701237. The next prime is 21503701243. The reversal of 21503701241 is 14210730512.

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

It is not a de Polignac number, because 21503701241 - 2² = 21503701237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21503701241.

It is not an unprimeable number, because it can be changed into a prime (21503701243) 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, 465956 + ... + 510021.

It is an arithmetic number, because the mean of its divisors is an integer number (2933789868).

Almost surely, 2^21503701241 is an apocalyptic number.

It is an amenable number.

21503701241 is a deficient number, since it is larger than the sum of its proper divisors (1966617703).

21503701241 is a wasteful number, since it uses less digits than its factorization.

21503701241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977991.

The product of its (nonzero) digits is 1680, while the sum is 26.

The spelling of 21503701241 in words is "twenty-one billion, five hundred three million, seven hundred one thousand, two hundred forty-one".