21245666016150 has 72 divisors (see below), whose sum is σ = 57095317868160. Its totient is φ = 5663992806720.

The previous prime is 21245666016149. The next prime is 21245666016151. The reversal of 21245666016150 is 5161066654212.

It is an interprime number because it is at equal distance from previous prime (21245666016149) and next prime (21245666016151).

It is a super-4 number, since 4×21245666016150⁴ (a number of 54 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 21245666016096 and 21245666016105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21245666016151) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4643830 + ... + 8003529.

Almost surely, 2^{21245666016150} is an apocalyptic number.

21245666016150 is an abundant number, since it is smaller than the sum of its proper divisors (35849651852010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21245666016150 is a wasteful number, since it uses less digits than its factorization.

21245666016150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12651110 (or 12651102 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 21245666016150 in words is "twenty-one trillion, two hundred forty-five billion, six hundred sixty-six million, sixteen thousand, one hundred fifty".