21130012124 has 12 divisors (see below), whose sum is σ = 39821946024. Its totient is φ = 9752313264.

The previous prime is 21130012121. The next prime is 21130012153. The reversal of 21130012124 is 42121003112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130012121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203173142 + ... + 203173245.

It is an arithmetic number, because the mean of its divisors is an integer number (3318495502).

Almost surely, 2^21130012124 is an apocalyptic number.

It is an amenable number.

21130012124 is a deficient number, since it is larger than the sum of its proper divisors (18691933900).

21130012124 is a wasteful number, since it uses less digits than its factorization.

21130012124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406346404 (or 406346402 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21130012124 its reverse (42121003112), we get a palindrome (63251015236).

The spelling of 21130012124 in words is "twenty-one billion, one hundred thirty million, twelve thousand, one hundred twenty-four".