21277098 has 48 divisors (see below), whose sum is σ = 50409216. Its totient is φ = 6456960.

The previous prime is 21277063. The next prime is 21277117. The reversal of 21277098 is 89077212.

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 23 ways as a sum of consecutive naturals, for example, 8365 + ... + 10607.

It is an arithmetic number, because the mean of its divisors is an integer number (1050192).

Almost surely, 2^21277098 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21277098, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25204608).

21277098 is an abundant number, since it is smaller than the sum of its proper divisors (29132118).

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

21277098 is a wasteful number, since it uses less digits than its factorization.

21277098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2299 (or 2296 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 21277098 is about 4612.7104830024. The cubic root of 21277098 is about 277.1005990309.

The spelling of 21277098 in words is "twenty-one million, two hundred seventy-seven thousand, ninety-eight".