21246053243550 has 24 divisors (see below), whose sum is σ = 52690212044376. Its totient is φ = 5665614198240.

The previous prime is 21246053243543. The next prime is 21246053243617. The reversal of 21246053243550 is 5534235064212.

It is a super-2 number, since 2×21246053243550² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70820177329 + ... + 70820177628.

It is an arithmetic number, because the mean of its divisors is an integer number (2195425501849).

Almost surely, 2^{21246053243550} is an apocalyptic number.

21246053243550 is an abundant number, since it is smaller than the sum of its proper divisors (31444158800826).

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

21246053243550 is a wasteful number, since it uses less digits than its factorization.

21246053243550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141640354972 (or 141640354967 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 42.

The spelling of 21246053243550 in words is "twenty-one trillion, two hundred forty-six billion, fifty-three million, two hundred forty-three thousand, five hundred fifty".