21520013110 has 16 divisors (see below), whose sum is σ = 38738700000. Its totient is φ = 8607410496.

The previous prime is 21520013107. The next prime is 21520013131. The reversal of 21520013110 is 1131002512.

It is a super-2 number, since 2×21520013110² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96271 + ... + 228709.

It is an arithmetic number, because the mean of its divisors is an integer number (2421168750).

Almost surely, 2^21520013110 is an apocalyptic number.

21520013110 is a deficient number, since it is larger than the sum of its proper divisors (17218686890).

21520013110 is a wasteful number, since it uses less digits than its factorization.

21520013110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148695.

The product of its (nonzero) digits is 60, while the sum is 16.

Adding to 21520013110 its reverse (1131002512), we get a palindrome (22651015622).

The spelling of 21520013110 in words is "twenty-one billion, five hundred twenty million, thirteen thousand, one hundred ten".