21115530145404 has 48 divisors (see below), whose sum is σ = 54771353280000. Its totient is φ = 7034988961008.

The previous prime is 21115530145399. The next prime is 21115530145481. The reversal of 21115530145404 is 40454103551112.

21115530145404 is a `hidden beast` number, since 2 + 1 + 115 + 530 + 1 + 4 + 5 + 4 + 0 + 4 = 666.

It is a super-2 number, since 2×21115530145404² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48687102 + ... + 49118885.

It is an arithmetic number, because the mean of its divisors is an integer number (1141069860000).

Almost surely, 2^{21115530145404} is an apocalyptic number.

It is an amenable number.

21115530145404 is an abundant number, since it is smaller than the sum of its proper divisors (33655823134596).

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

21115530145404 is a wasteful number, since it uses less digits than its factorization.

21115530145404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97807999 (or 97807991 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

Adding to 21115530145404 its reverse (40454103551112), we get a palindrome (61569633696516).

The spelling of 21115530145404 in words is "twenty-one trillion, one hundred fifteen billion, five hundred thirty million, one hundred forty-five thousand, four hundred four".