21120155500611 has 16 divisors (see below), whose sum is σ = 29190579471360. Its totient is φ = 13566895282080.

The previous prime is 21120155500547. The next prime is 21120155500783. The reversal of 21120155500611 is 11600555102112.

It is not a de Polignac number, because 21120155500611 - 2⁶ = 21120155500547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120155540611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247167475 + ... + 247252908.

It is an arithmetic number, because the mean of its divisors is an integer number (1824411216960).

Almost surely, 2^{21120155500611} is an apocalyptic number.

21120155500611 is a deficient number, since it is larger than the sum of its proper divisors (8070423970749).

21120155500611 is a wasteful number, since it uses less digits than its factorization.

21120155500611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494420906.

The product of its (nonzero) digits is 3000, while the sum is 30.

The spelling of 21120155500611 in words is "twenty-one trillion, one hundred twenty billion, one hundred fifty-five million, five hundred thousand, six hundred eleven".