21612025412 has 6 divisors (see below), whose sum is σ = 37821044478. Its totient is φ = 10806012704.

The previous prime is 21612025313. The next prime is 21612025427. The reversal of 21612025412 is 21452021612.

It can be written as a sum of positive squares in only one way, i.e., 21092914756 + 519110656 = 145234^2 + 22784^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2701503173 + ... + 2701503180.

It is an arithmetic number, because the mean of its divisors is an integer number (6303507413).

Almost surely, 2^21612025412 is an apocalyptic number.

It is an amenable number.

21612025412 is a deficient number, since it is larger than the sum of its proper divisors (16209019066).

21612025412 is a wasteful number, since it uses less digits than its factorization.

21612025412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5403006357 (or 5403006355 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The spelling of 21612025412 in words is "twenty-one billion, six hundred twelve million, twenty-five thousand, four hundred twelve".