21154044826 has 16 divisors (see below), whose sum is σ = 33721591680. Its totient is φ = 9918106560.

The previous prime is 21154044811. The next prime is 21154044827. The reversal of 21154044826 is 62844045112.

It is a super-2 number, since 2×21154044826² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21154044827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1138716 + ... + 1157143.

It is an arithmetic number, because the mean of its divisors is an integer number (2107599480).

Almost surely, 2^21154044826 is an apocalyptic number.

21154044826 is a deficient number, since it is larger than the sum of its proper divisors (12567546854).

21154044826 is a wasteful number, since it uses less digits than its factorization.

21154044826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2296149.

The product of its (nonzero) digits is 61440, while the sum is 37.

Adding to 21154044826 its reverse (62844045112), we get a palindrome (83998089938).

The spelling of 21154044826 in words is "twenty-one billion, one hundred fifty-four million, forty-four thousand, eight hundred twenty-six".