21091702098 has 64 divisors (see below), whose sum is σ = 44698510080. Its totient is φ = 6621170688.

The previous prime is 21091702087. The next prime is 21091702123. The reversal of 21091702098 is 89020719012.

It is a super-3 number, since 3×21091702098³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 7140990 + ... + 7143942.

It is an arithmetic number, because the mean of its divisors is an integer number (698414220).

Almost surely, 2^21091702098 is an apocalyptic number.

21091702098 is an abundant number, since it is smaller than the sum of its proper divisors (23606807982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21091702098 is a wasteful number, since it uses less digits than its factorization.

21091702098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3763.

The product of its (nonzero) digits is 18144, while the sum is 39.

The spelling of 21091702098 in words is "twenty-one billion, ninety-one million, seven hundred two thousand, ninety-eight".