21151147099 has 4 divisors (see below), whose sum is σ = 21170606464. Its totient is φ = 21131687736.

The previous prime is 21151147067. The next prime is 21151147141. The reversal of 21151147099 is 99074115112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21151147099 - 2⁵ = 21151147067 is a prime.

It is a super-2 number, since 2×21151147099² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21151147399) 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 3 ways as a sum of consecutive naturals, for example, 9728052 + ... + 9730225.

It is an arithmetic number, because the mean of its divisors is an integer number (5292651616).

Almost surely, 2^21151147099 is an apocalyptic number.

21151147099 is a deficient number, since it is larger than the sum of its proper divisors (19459365).

21151147099 is a wasteful number, since it uses less digits than its factorization.

21151147099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19459364.

The product of its (nonzero) digits is 22680, while the sum is 40.

The spelling of 21151147099 in words is "twenty-one billion, one hundred fifty-one million, one hundred forty-seven thousand, ninety-nine".