21121232149 has 8 divisors (see below), whose sum is σ = 21188822400. Its totient is φ = 21053728800.

The previous prime is 21121232141. The next prime is 21121232159. The reversal of 21121232149 is 94123212112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21121232149 - 2³ = 21121232141 is a prime.

It is a super-2 number, since 2×21121232149² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121232141) by changing a digit.

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, 483777 + ... + 525625.

It is an arithmetic number, because the mean of its divisors is an integer number (2648602800).

Almost surely, 2^21121232149 is an apocalyptic number.

It is an amenable number.

21121232149 is a deficient number, since it is larger than the sum of its proper divisors (67590251).

21121232149 is a wasteful number, since it uses less digits than its factorization.

21121232149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43451.

The product of its digits is 1728, while the sum is 28.

The spelling of 21121232149 in words is "twenty-one billion, one hundred twenty-one million, two hundred thirty-two thousand, one hundred forty-nine".