21149068943 has 4 divisors (see below), whose sum is σ = 22393131840. Its totient is φ = 19905006048.

The previous prime is 21149068937. The next prime is 21149068949. The reversal of 21149068943 is 34986094112.

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

It is an interprime number because it is at equal distance from previous prime (21149068937) and next prime (21149068949).

It is a cyclic number.

It is not a de Polignac number, because 21149068943 - 2¹² = 21149064847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21149068949) 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, 622031423 + ... + 622031456.

It is an arithmetic number, because the mean of its divisors is an integer number (5598282960).

Almost surely, 2^21149068943 is an apocalyptic number.

21149068943 is a deficient number, since it is larger than the sum of its proper divisors (1244062897).

21149068943 is a wasteful number, since it uses less digits than its factorization.

21149068943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244062896.

The product of its (nonzero) digits is 373248, while the sum is 47.

The spelling of 21149068943 in words is "twenty-one billion, one hundred forty-nine million, sixty-eight thousand, nine hundred forty-three".