21587785142648 has 64 divisors (see below), whose sum is σ = 41996799336960. Its totient is φ = 10394721277056.

The previous prime is 21587785142629. The next prime is 21587785142653. The reversal of 21587785142648 is 84624158778512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57954965 + ... + 58326267.

It is an arithmetic number, because the mean of its divisors is an integer number (656199989640).

Almost surely, 2^{21587785142648} is an apocalyptic number.

It is an amenable number.

21587785142648 is a deficient number, since it is larger than the sum of its proper divisors (20409014194312).

21587785142648 is a wasteful number, since it uses less digits than its factorization.

21587785142648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373356 (or 373352 counting only the distinct ones).

The product of its digits is 240844800, while the sum is 68.

The spelling of 21587785142648 in words is "twenty-one trillion, five hundred eighty-seven billion, seven hundred eighty-five million, one hundred forty-two thousand, six hundred forty-eight".