21520130104 has 32 divisors (see below), whose sum is σ = 44638439040. Its totient is φ = 9644101600.

The previous prime is 21520130101. The next prime is 21520130129. The reversal of 21520130104 is 40103102512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21520130101) 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, 1715914 + ... + 1728409.

It is an arithmetic number, because the mean of its divisors is an integer number (1394951220).

Almost surely, 2^21520130104 is an apocalyptic number.

It is an amenable number.

21520130104 is an abundant number, since it is smaller than the sum of its proper divisors (23118308936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21520130104 is a wasteful number, since it uses less digits than its factorization.

21520130104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3444411 (or 3444407 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21520130104 its reverse (40103102512), we get a palindrome (61623232616).

The spelling of 21520130104 in words is "twenty-one billion, five hundred twenty million, one hundred thirty thousand, one hundred four".