21198247643 has 8 divisors (see below), whose sum is σ = 22216509600. Its totient is φ = 20188035648.

The previous prime is 21198247633. The next prime is 21198247663. The reversal of 21198247643 is 34674289112.

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

It is a cyclic number.

It is not a de Polignac number, because 21198247643 - 2⁴ = 21198247627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21198247613) 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, 2007098 + ... + 2017631.

It is an arithmetic number, because the mean of its divisors is an integer number (2777063700).

Almost surely, 2^21198247643 is an apocalyptic number.

21198247643 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21198247643 is a deficient number, since it is larger than the sum of its proper divisors (1018261957).

21198247643 is a wasteful number, since it uses less digits than its factorization.

21198247643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4024981.

The product of its digits is 580608, while the sum is 47.

The spelling of 21198247643 in words is "twenty-one billion, one hundred ninety-eight million, two hundred forty-seven thousand, six hundred forty-three".