20135147426721 has 24 divisors (see below), whose sum is σ = 29410594886400. Its totient is φ = 13273550506656.

The previous prime is 20135147426711. The next prime is 20135147426743. The reversal of 20135147426721 is 12762474153102.

20135147426721 is a `hidden beast` number, since 2 + 0 + 1 + 3 + 514 + 74 + 2 + 67 + 2 + 1 = 666.

It is not a de Polignac number, because 20135147426721 - 2¹⁵ = 20135147393953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20135147426711) 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, 33366931 + ... + 33965016.

It is an arithmetic number, because the mean of its divisors is an integer number (1225441453600).

Almost surely, 2^{20135147426721} is an apocalyptic number.

It is an amenable number.

20135147426721 is a deficient number, since it is larger than the sum of its proper divisors (9275447459679).

20135147426721 is a wasteful number, since it uses less digits than its factorization.

20135147426721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67332325 (or 67332322 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 20135147426721 in words is "twenty trillion, one hundred thirty-five billion, one hundred forty-seven million, four hundred twenty-six thousand, seven hundred twenty-one".