21098642339 has 16 divisors (see below), whose sum is σ = 21957266400. Its totient is φ = 20249139456.

The previous prime is 21098642317. The next prime is 21098642351. The reversal of 21098642339 is 93324689012.

It is a cyclic number.

It is not a de Polignac number, because 21098642339 - 2¹² = 21098638243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21098642293 and 21098642302.

It is not an unprimeable number, because it can be changed into a prime (21098642639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3437117 + ... + 3443249.

It is an arithmetic number, because the mean of its divisors is an integer number (1372329150).

Almost surely, 2^21098642339 is an apocalyptic number.

21098642339 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21098642339 is a deficient number, since it is larger than the sum of its proper divisors (858624061).

21098642339 is a wasteful number, since it uses less digits than its factorization.

21098642339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6854.

The product of its (nonzero) digits is 559872, while the sum is 47.

The spelling of 21098642339 in words is "twenty-one billion, ninety-eight million, six hundred forty-two thousand, three hundred thirty-nine".