21453631473026 has 4 divisors (see below), whose sum is σ = 32180447209542. Its totient is φ = 10726815736512.

The previous prime is 21453631472989. The next prime is 21453631473037. The reversal of 21453631473026 is 62037413635412.

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., 20108507031001 + 1345124442025 = 4484251^2 + 1159795^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5363407868255 + ... + 5363407868258.

Almost surely, 2^{21453631473026} is an apocalyptic number.

21453631473026 is a deficient number, since it is larger than the sum of its proper divisors (10726815736516).

21453631473026 is a wasteful number, since it uses less digits than its factorization.

21453631473026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10726815736515.

The product of its (nonzero) digits is 2177280, while the sum is 47.

The spelling of 21453631473026 in words is "twenty-one trillion, four hundred fifty-three billion, six hundred thirty-one million, four hundred seventy-three thousand, twenty-six".