21157759953355 has 32 divisors (see below), whose sum is σ = 25793475379200. Its totient is φ = 16658182075392.

The previous prime is 21157759953313. The next prime is 21157759953373. The reversal of 21157759953355 is 55335995775112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21157759953355 - 2⁹ = 21157759952843 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 379095862 + ... + 379151668.

It is an arithmetic number, because the mean of its divisors is an integer number (806046105600).

Almost surely, 2^{21157759953355} is an apocalyptic number.

21157759953355 is a deficient number, since it is larger than the sum of its proper divisors (4635715425845).

21157759953355 is a wasteful number, since it uses less digits than its factorization.

21157759953355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58963.

The product of its digits is 223256250, while the sum is 67.

The spelling of 21157759953355 in words is "twenty-one trillion, one hundred fifty-seven billion, seven hundred fifty-nine million, nine hundred fifty-three thousand, three hundred fifty-five".