20615201567121 has 48 divisors (see below), whose sum is σ = 33856610713920. Its totient is φ = 11086789432320.

The previous prime is 20615201567113. The next prime is 20615201567131. The reversal of 20615201567121 is 12176510251602.

It is not a de Polignac number, because 20615201567121 - 2³ = 20615201567113 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20615201567121.

It is not an unprimeable number, because it can be changed into a prime (20615201567131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 83065306 + ... + 83313116.

It is an arithmetic number, because the mean of its divisors is an integer number (705346056540).

Almost surely, 2^{20615201567121} is an apocalyptic number.

20615201567121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20615201567121 is a deficient number, since it is larger than the sum of its proper divisors (13241409146799).

20615201567121 is a wasteful number, since it uses less digits than its factorization.

20615201567121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281134 (or 281127 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 39.

The spelling of 20615201567121 in words is "twenty trillion, six hundred fifteen billion, two hundred one million, five hundred sixty-seven thousand, one hundred twenty-one".