21499129312 has 24 divisors (see below), whose sum is σ = 42341719896. Its totient is φ = 10745676672.

The previous prime is 21499129307. The next prime is 21499129349. The reversal of 21499129312 is 21392199412.

It is a super-2 number, since 2×21499129312² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30598 + ... + 209605.

It is an arithmetic number, because the mean of its divisors is an integer number (1764238329).

Almost surely, 2^21499129312 is an apocalyptic number.

It is an amenable number.

21499129312 is a deficient number, since it is larger than the sum of its proper divisors (20842590584).

21499129312 is a wasteful number, since it uses less digits than its factorization.

21499129312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243010 (or 243002 counting only the distinct ones).

The product of its digits is 69984, while the sum is 43.

The spelling of 21499129312 in words is "twenty-one billion, four hundred ninety-nine million, one hundred twenty-nine thousand, three hundred twelve".