21112411555146 has 32 divisors (see below), whose sum is σ = 44448203649600. Its totient is φ = 6666924119040.

The previous prime is 21112411555093. The next prime is 21112411555171. The reversal of 21112411555146 is 64155511421112.

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, 2906476 + ... + 7118456.

It is an arithmetic number, because the mean of its divisors is an integer number (1389006364050).

Almost surely, 2^{21112411555146} is an apocalyptic number.

21112411555146 is an abundant number, since it is smaller than the sum of its proper divisors (23335792094454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21112411555146 is a wasteful number, since it uses less digits than its factorization.

21112411555146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4255974.

The product of its digits is 48000, while the sum is 39.

Adding to 21112411555146 its reverse (64155511421112), we get a palindrome (85267922976258).

The spelling of 21112411555146 in words is "twenty-one trillion, one hundred twelve billion, four hundred eleven million, five hundred fifty-five thousand, one hundred forty-six".