21947190351 has 8 divisors (see below), whose sum is σ = 29324014080. Its totient is φ = 14600913432.

The previous prime is 21947190337. The next prime is 21947190367. The reversal of 21947190351 is 15309174912.

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

It is not a de Polignac number, because 21947190351 - 2¹⁴ = 21947173967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21947190151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7635025 + ... + 7637898.

It is an arithmetic number, because the mean of its divisors is an integer number (3665501760).

Almost surely, 2^21947190351 is an apocalyptic number.

21947190351 is a deficient number, since it is larger than the sum of its proper divisors (7376823729).

21947190351 is a wasteful number, since it uses less digits than its factorization.

21947190351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15273405.

The product of its (nonzero) digits is 68040, while the sum is 42.

The spelling of 21947190351 in words is "twenty-one billion, nine hundred forty-seven million, one hundred ninety thousand, three hundred fifty-one".