21154662110404 has 12 divisors (see below), whose sum is σ = 37022026321084. Its totient is φ = 10576940304384.

The previous prime is 21154662110371. The next prime is 21154662110431. The reversal of 21154662110404 is 40401126645112.

It can be written as a sum of positive squares in 2 ways, for example, as 8168152568004 + 12986509542400 = 2857998^2 + 3603680^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97565877 + ... + 97782460.

Almost surely, 2^{21154662110404} is an apocalyptic number.

It is an amenable number.

21154662110404 is a deficient number, since it is larger than the sum of its proper divisors (15867364210680).

21154662110404 is a wasteful number, since it uses less digits than its factorization.

21154662110404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195375414 (or 195375412 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

Adding to 21154662110404 its reverse (40401126645112), we get a palindrome (61555788755516).

It can be divided in two parts, 211546621 and 10404, that added together give a square (211557025 = 14545²).

The spelling of 21154662110404 in words is "twenty-one trillion, one hundred fifty-four billion, six hundred sixty-two million, one hundred ten thousand, four hundred four".