21319756297 has 8 divisors (see below), whose sum is σ = 24382239552. Its totient is φ = 18261474000.

The previous prime is 21319756291. The next prime is 21319756301. The reversal of 21319756297 is 79265791312.

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

It is not a de Polignac number, because 21319756297 - 2³¹ = 19172272649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21319756291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1039354 + ... + 1059667.

It is an arithmetic number, because the mean of its divisors is an integer number (3047779944).

Almost surely, 2^21319756297 is an apocalyptic number.

It is an amenable number.

21319756297 is a deficient number, since it is larger than the sum of its proper divisors (3062483255).

21319756297 is a wasteful number, since it uses less digits than its factorization.

21319756297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100479.

The product of its digits is 1428840, while the sum is 52.

The spelling of 21319756297 in words is "twenty-one billion, three hundred nineteen million, seven hundred fifty-six thousand, two hundred ninety-seven".