21547960502 has 4 divisors (see below), whose sum is σ = 32321940756. Its totient is φ = 10773980250.

The previous prime is 21547960501. The next prime is 21547960549. The reversal of 21547960502 is 20506974512.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21547960502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21547960501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5386990124 + ... + 5386990127.

It is an arithmetic number, because the mean of its divisors is an integer number (8080485189).

Almost surely, 2^21547960502 is an apocalyptic number.

21547960502 is a deficient number, since it is larger than the sum of its proper divisors (10773980254).

21547960502 is a wasteful number, since it uses less digits than its factorization.

21547960502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10773980253.

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 21547960502 in words is "twenty-one billion, five hundred forty-seven million, nine hundred sixty thousand, five hundred two".