21415361243870 has 64 divisors (see below), whose sum is σ = 42114836155392. Its totient is φ = 7775770464000.

The previous prime is 21415361243849. The next prime is 21415361243879. The reversal of 21415361243870 is 7834216351412.

It is a super-2 number, since 2×21415361243870² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21415361243879) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 300779975 + ... + 300851165.

It is an arithmetic number, because the mean of its divisors is an integer number (658044314928).

Almost surely, 2^{21415361243870} is an apocalyptic number.

21415361243870 is a deficient number, since it is larger than the sum of its proper divisors (20699474911522).

21415361243870 is a wasteful number, since it uses less digits than its factorization.

21415361243870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75257.

The product of its (nonzero) digits is 967680, while the sum is 47.

The spelling of 21415361243870 in words is "twenty-one trillion, four hundred fifteen billion, three hundred sixty-one million, two hundred forty-three thousand, eight hundred seventy".