21898661754 has 16 divisors (see below), whose sum is σ = 44076289248. Its totient is φ = 7253059632.

The previous prime is 21898661753. The next prime is 21898661779. The reversal of 21898661754 is 45716689812.

It is a super-2 number, since 2×21898661754² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21898661694 and 21898661703.

It is not an unprimeable number, because it can be changed into a prime (21898661753) by changing a digit.

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, 11622552 + ... + 11624435.

It is an arithmetic number, because the mean of its divisors is an integer number (2754768078).

Almost surely, 2^21898661754 is an apocalyptic number.

21898661754 is an abundant number, since it is smaller than the sum of its proper divisors (22177627494).

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

21898661754 is a wasteful number, since it uses less digits than its factorization.

21898661754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23247149.

The product of its digits is 5806080, while the sum is 57.

The spelling of 21898661754 in words is "twenty-one billion, eight hundred ninety-eight million, six hundred sixty-one thousand, seven hundred fifty-four".