21155166050254 has 8 divisors (see below), whose sum is σ = 31749030635400. Its totient is φ = 10572155838456.

The previous prime is 21155166050209. The next prime is 21155166050321. The reversal of 21155166050254 is 45205066155112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21155166050254² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21155166050254.

It is a congruent number.

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, 2713588464 + ... + 2713596259.

It is an arithmetic number, because the mean of its divisors is an integer number (3968628829425).

Almost surely, 2^{21155166050254} is an apocalyptic number.

21155166050254 is a deficient number, since it is larger than the sum of its proper divisors (10593864585146).

21155166050254 is a wasteful number, since it uses less digits than its factorization.

21155166050254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5427186674.

The product of its (nonzero) digits is 360000, while the sum is 43.

The spelling of 21155166050254 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred sixty-six million, fifty thousand, two hundred fifty-four".