21225150165 has 16 divisors (see below), whose sum is σ = 35957901888. Its totient is φ = 10654192896.

The previous prime is 21225150161. The next prime is 21225150169. The reversal of 21225150165 is 56105152212.

It is an interprime number because it is at equal distance from previous prime (21225150161) and next prime (21225150169).

It is not a de Polignac number, because 21225150165 - 2² = 21225150161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21225150161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41617687 + ... + 41618196.

It is an arithmetic number, because the mean of its divisors is an integer number (2247368868).

Almost surely, 2^21225150165 is an apocalyptic number.

It is an amenable number.

21225150165 is a deficient number, since it is larger than the sum of its proper divisors (14732751723).

21225150165 is a wasteful number, since it uses less digits than its factorization.

21225150165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83235908.

The product of its (nonzero) digits is 6000, while the sum is 30.

The spelling of 21225150165 in words is "twenty-one billion, two hundred twenty-five million, one hundred fifty thousand, one hundred sixty-five".