21212130999 has 32 divisors (see below), whose sum is σ = 28851383808. Its totient is φ = 13860720000.

The previous prime is 21212130983. The next prime is 21212131019. The reversal of 21212130999 is 99903121212.

It is not a de Polignac number, because 21212130999 - 2⁴ = 21212130983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212132999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15359289 + ... + 15360669.

It is an arithmetic number, because the mean of its divisors is an integer number (901605744).

Almost surely, 2^21212130999 is an apocalyptic number.

21212130999 is a deficient number, since it is larger than the sum of its proper divisors (7639252809).

21212130999 is a wasteful number, since it uses less digits than its factorization.

21212130999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1959.

The product of its (nonzero) digits is 17496, while the sum is 39.

The spelling of 21212130999 in words is "twenty-one billion, two hundred twelve million, one hundred thirty thousand, nine hundred ninety-nine".