21130022012 has 24 divisors (see below), whose sum is σ = 41429382960. Its totient is φ = 9344972160.

The previous prime is 21130022009. The next prime is 21130022027. The reversal of 21130022012 is 21022003112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6487937 + ... + 6491192.

It is an arithmetic number, because the mean of its divisors is an integer number (1726224290).

Almost surely, 2^21130022012 is an apocalyptic number.

21130022012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21130022012 is a deficient number, since it is larger than the sum of its proper divisors (20299360948).

21130022012 is a wasteful number, since it uses less digits than its factorization.

21130022012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12979181 (or 12979179 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21130022012 its reverse (21022003112), we get a palindrome (42152025124).

The spelling of 21130022012 in words is "twenty-one billion, one hundred thirty million, twenty-two thousand, twelve".