21612112055266 has 4 divisors (see below), whose sum is σ = 32418168082902. Its totient is φ = 10806056027632.

The previous prime is 21612112055239. The next prime is 21612112055327. The reversal of 21612112055266 is 66255021121612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18288495015025 + 3323617040241 = 4276505^2 + 1823079^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5403028013815 + ... + 5403028013818.

Almost surely, 2^{21612112055266} is an apocalyptic number.

21612112055266 is a deficient number, since it is larger than the sum of its proper divisors (10806056027636).

21612112055266 is a wasteful number, since it uses less digits than its factorization.

21612112055266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10806056027635.

The product of its (nonzero) digits is 86400, while the sum is 40.

Adding to 21612112055266 its reverse (66255021121612), we get a palindrome (87867133176878).

The spelling of 21612112055266 in words is "twenty-one trillion, six hundred twelve billion, one hundred twelve million, fifty-five thousand, two hundred sixty-six".