21660363154226 has 4 divisors (see below), whose sum is σ = 32490544731342. Its totient is φ = 10830181577112.

The previous prime is 21660363154153. The next prime is 21660363154229. The reversal of 21660363154226 is 62245136306612.

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., 13095966757225 + 8564396397001 = 3618835^2 + 2926499^2 .

It is a super-3 number, since 3×21660363154226³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21660363154229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5415090788555 + ... + 5415090788558.

Almost surely, 2^{21660363154226} is an apocalyptic number.

21660363154226 is a deficient number, since it is larger than the sum of its proper divisors (10830181577116).

21660363154226 is a wasteful number, since it uses less digits than its factorization.

21660363154226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10830181577115.

The product of its (nonzero) digits is 1866240, while the sum is 47.

The spelling of 21660363154226 in words is "twenty-one trillion, six hundred sixty billion, three hundred sixty-three million, one hundred fifty-four thousand, two hundred twenty-six".