21651036198 has 32 divisors (see below), whose sum is σ = 47943688320. Its totient is φ = 6462994560.

The previous prime is 21651036179. The next prime is 21651036247. The reversal of 21651036198 is 89163015612.

It is a super-3 number, since 3×21651036198³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2443683 + ... + 2452526.

It is an arithmetic number, because the mean of its divisors is an integer number (1498240260).

Almost surely, 2^21651036198 is an apocalyptic number.

21651036198 is an abundant number, since it is smaller than the sum of its proper divisors (26292652122).

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

21651036198 is a wasteful number, since it uses less digits than its factorization.

21651036198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4896292.

The product of its (nonzero) digits is 77760, while the sum is 42.

The spelling of 21651036198 in words is "twenty-one billion, six hundred fifty-one million, thirty-six thousand, one hundred ninety-eight".