20151521055 has 48 divisors (see below), whose sum is σ = 35642280960. Its totient is φ = 10530187200.

The previous prime is 20151521053. The next prime is 20151521063. The reversal of 20151521055 is 55012515102.

It is not a de Polignac number, because 20151521055 - 2¹ = 20151521053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20151521051) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 444070 + ... + 487340.

It is an arithmetic number, because the mean of its divisors is an integer number (742547520).

Almost surely, 2^20151521055 is an apocalyptic number.

20151521055 is a deficient number, since it is larger than the sum of its proper divisors (15490759905).

20151521055 is a wasteful number, since it uses less digits than its factorization.

20151521055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43492 (or 43489 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 27.

The spelling of 20151521055 in words is "twenty billion, one hundred fifty-one million, five hundred twenty-one thousand, fifty-five".