21155026562111 has 16 divisors (see below), whose sum is σ = 24900618048768. Its totient is φ = 17786155737600.

The previous prime is 21155026562099. The next prime is 21155026562119. The reversal of 21155026562111 is 11126562055112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21155026562111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21155026562119) 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, 1543930280 + ... + 1543943981.

It is an arithmetic number, because the mean of its divisors is an integer number (1556288628048).

Almost surely, 2^{21155026562111} is an apocalyptic number.

21155026562111 is a deficient number, since it is larger than the sum of its proper divisors (3745591486657).

21155026562111 is a wasteful number, since it uses less digits than its factorization.

21155026562111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3087874322.

The product of its (nonzero) digits is 36000, while the sum is 38.

The spelling of 21155026562111 in words is "twenty-one trillion, one hundred fifty-five billion, twenty-six million, five hundred sixty-two thousand, one hundred eleven".