21161434771750 has 384 divisors, whose sum is σ = 50705978109696. Its totient is φ = 6552741888000.

The previous prime is 21161434771723. The next prime is 21161434771801. The reversal of 21161434771750 is 5717743416112.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a junction number, because it is equal to n+sod(n) for n = 21161434771694 and 21161434771703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1874844607 + ... + 1874855893.

It is an arithmetic number, because the mean of its divisors is an integer number (132046817994).

Almost surely, 2^{21161434771750} is an apocalyptic number.

21161434771750 is an abundant number, since it is smaller than the sum of its proper divisors (29544543337946).

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

21161434771750 is a wasteful number, since it uses less digits than its factorization.

21161434771750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11585 (or 11568 counting only the distinct ones).

The product of its (nonzero) digits is 987840, while the sum is 49.

The spelling of 21161434771750 in words is "twenty-one trillion, one hundred sixty-one billion, four hundred thirty-four million, seven hundred seventy-one thousand, seven hundred fifty".