21155013436411 has 32 divisors (see below), whose sum is σ = 23081750616960. Its totient is φ = 19307749939200.

The previous prime is 21155013436399. The next prime is 21155013436433. The reversal of 21155013436411 is 11463431055112.

It is a cyclic number.

It is not a de Polignac number, because 21155013436411 - 2¹⁷ = 21155013305339 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21155013436481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 420209101 + ... + 420259441.

It is an arithmetic number, because the mean of its divisors is an integer number (721304706780).

Almost surely, 2^{21155013436411} is an apocalyptic number.

21155013436411 is a deficient number, since it is larger than the sum of its proper divisors (1926737180549).

21155013436411 is a wasteful number, since it uses less digits than its factorization.

21155013436411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52615.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 21155013436411 in words is "twenty-one trillion, one hundred fifty-five billion, thirteen million, four hundred thirty-six thousand, four hundred eleven".