21149762903 has 4 divisors (see below), whose sum is σ = 21150932040. Its totient is φ = 21148593768.

The previous prime is 21149762899. The next prime is 21149762911. The reversal of 21149762903 is 30926794112.

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 21149762903 - 2² = 21149762899 is a prime.

It is a super-2 number, since 2×21149762903² (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 (21149762303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 557000 + ... + 593757.

It is an arithmetic number, because the mean of its divisors is an integer number (5287733010).

Almost surely, 2^21149762903 is an apocalyptic number.

21149762903 is a deficient number, since it is larger than the sum of its proper divisors (1169137).

21149762903 is a wasteful number, since it uses less digits than its factorization.

21149762903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169136.

The product of its (nonzero) digits is 163296, while the sum is 44.

The spelling of 21149762903 in words is "twenty-one billion, one hundred forty-nine million, seven hundred sixty-two thousand, nine hundred three".