21130404102 has 24 divisors (see below), whose sum is σ = 46756640736. Its totient is φ = 6893606736.

The previous prime is 21130404091. The next prime is 21130404161. The reversal of 21130404102 is 20140403112.

21130404102 is a `hidden beast` number, since 211 + 3 + 0 + 40 + 410 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12487573 + ... + 12489264.

It is an arithmetic number, because the mean of its divisors is an integer number (1948193364).

Almost surely, 2^21130404102 is an apocalyptic number.

21130404102 is an abundant number, since it is smaller than the sum of its proper divisors (25626236634).

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

21130404102 is a wasteful number, since it uses less digits than its factorization.

21130404102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24976892 (or 24976889 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21130404102 its reverse (20140403112), we get a palindrome (41270807214).

The spelling of 21130404102 in words is "twenty-one billion, one hundred thirty million, four hundred four thousand, one hundred two".