21150216265642 has 8 divisors (see below), whose sum is σ = 31725877151556. Its totient is φ = 10574923881792.

The previous prime is 21150216265631. The next prime is 21150216265667. The reversal of 21150216265642 is 24656261205112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20850995231521 + 299221034121 = 4566289^2 + 547011^2 .

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

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, 91981983 + ... + 92211634.

Almost surely, 2^{21150216265642} is an apocalyptic number.

21150216265642 is a deficient number, since it is larger than the sum of its proper divisors (10575660885914).

21150216265642 is a wasteful number, since it uses less digits than its factorization.

21150216265642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184251032.

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 21150216265642 in words is "twenty-one trillion, one hundred fifty billion, two hundred sixteen million, two hundred sixty-five thousand, six hundred forty-two".