21507003406104 has 16 divisors (see below), whose sum is σ = 53767508515320. Its totient is φ = 7169001135360.

The previous prime is 21507003406067. The next prime is 21507003406117. The reversal of 21507003406104 is 40160430070512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 448062570937 + ... + 448062570984.

Almost surely, 2^{21507003406104} is an apocalyptic number.

21507003406104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21507003406104 is an abundant number, since it is smaller than the sum of its proper divisors (32260505109216).

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

21507003406104 is a wasteful number, since it uses less digits than its factorization.

21507003406104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896125141930 (or 896125141926 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

Adding to 21507003406104 its reverse (40160430070512), we get a palindrome (61667433476616).

The spelling of 21507003406104 in words is "twenty-one trillion, five hundred seven billion, three million, four hundred six thousand, one hundred four".