21522012221535 has 48 divisors (see below), whose sum is σ = 40470258167136. Its totient is φ = 9737204908032.

The previous prime is 21522012221531. The next prime is 21522012221579. The reversal of 21522012221535 is 53512221022512.

It is not a de Polignac number, because 21522012221535 - 2² = 21522012221531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21522012221496 and 21522012221505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522012221531) 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, 150865042 + ... + 151007631.

It is an arithmetic number, because the mean of its divisors is an integer number (843130378482).

Almost surely, 2^{21522012221535} is an apocalyptic number.

21522012221535 is a deficient number, since it is larger than the sum of its proper divisors (18948245945601).

21522012221535 is a wasteful number, since it uses less digits than its factorization.

21522012221535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301872792 (or 301872785 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 33.

The spelling of 21522012221535 in words is "twenty-one trillion, five hundred twenty-two billion, twelve million, two hundred twenty-one thousand, five hundred thirty-five".