21420155131105 has 16 divisors (see below), whose sum is σ = 25753399282944. Its totient is φ = 17103319542720.

The previous prime is 21420155131091. The next prime is 21420155131121. The reversal of 21420155131105 is 50113155102412.

It is not a de Polignac number, because 21420155131105 - 2¹³ = 21420155122913 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41963244 + ... + 42470626.

It is an arithmetic number, because the mean of its divisors is an integer number (1609587455184).

Almost surely, 2^{21420155131105} is an apocalyptic number.

It is an amenable number.

21420155131105 is a deficient number, since it is larger than the sum of its proper divisors (4333244151839).

21420155131105 is a wasteful number, since it uses less digits than its factorization.

21420155131105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523536.

The product of its (nonzero) digits is 6000, while the sum is 31.

The spelling of 21420155131105 in words is "twenty-one trillion, four hundred twenty billion, one hundred fifty-five million, one hundred thirty-one thousand, one hundred five".