21757074034087 has 24 divisors (see below), whose sum is σ = 25915186501776. Its totient is φ = 18203021722368.

The previous prime is 21757074034037. The next prime is 21757074034121. The reversal of 21757074034087 is 78043047075712.

It is a happy number.

It is not a de Polignac number, because 21757074034087 - 2¹⁵ = 21757074001319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21757074034037) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 312418 + ... + 6603919.

It is an arithmetic number, because the mean of its divisors is an integer number (1079799437574).

Almost surely, 2^{21757074034087} is an apocalyptic number.

21757074034087 is a deficient number, since it is larger than the sum of its proper divisors (4158112467689).

21757074034087 is a wasteful number, since it uses less digits than its factorization.

21757074034087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6917887 (or 6917880 counting only the distinct ones).

The product of its (nonzero) digits is 9219840, while the sum is 55.

The spelling of 21757074034087 in words is "twenty-one trillion, seven hundred fifty-seven billion, seventy-four million, thirty-four thousand, eighty-seven".