21436674448 has 30 divisors (see below), whose sum is σ = 48314547366. Its totient is φ = 9187145856.

The previous prime is 21436674439. The next prime is 21436674491. The reversal of 21436674448 is 84447663412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21436473744 + 200704 = 146412^2 + 448^2 .

It is a super-2 number, since 2×21436674448² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13670565 + ... + 13672132.

Almost surely, 2^21436674448 is an apocalyptic number.

21436674448 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21436674448 is an abundant number, since it is smaller than the sum of its proper divisors (26877872918).

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

21436674448 is a wasteful number, since it uses less digits than its factorization.

21436674448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27342719 (or 27342706 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 49.

The spelling of 21436674448 in words is "twenty-one billion, four hundred thirty-six million, six hundred seventy-four thousand, four hundred forty-eight".