21756099414 has 16 divisors (see below), whose sum is σ = 49728227328. Its totient is φ = 6216028392.

The previous prime is 21756099403. The next prime is 21756099457. The reversal of 21756099414 is 41499065712.

It is a happy number.

It is a super-2 number, since 2×21756099414² (a number of 21 digits) contains 22 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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259001142 + ... + 259001225.

It is an arithmetic number, because the mean of its divisors is an integer number (3108014208).

Almost surely, 2^21756099414 is an apocalyptic number.

21756099414 is an abundant number, since it is smaller than the sum of its proper divisors (27972127914).

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

21756099414 is a wasteful number, since it uses less digits than its factorization.

21756099414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518002379.

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 21756099414 in words is "twenty-one billion, seven hundred fifty-six million, ninety-nine thousand, four hundred fourteen".