2123442155554 has 4 divisors (see below), whose sum is σ = 3185163233334. Its totient is φ = 1061721077776.

The previous prime is 2123442155509. The next prime is 2123442155561. The reversal of 2123442155554 is 4555512443212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1950030709225 + 173411446329 = 1396435^2 + 416427^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2123442155554.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 530860538887 + ... + 530860538890.

Almost surely, 2^{2123442155554} is an apocalyptic number.

2123442155554 is a deficient number, since it is larger than the sum of its proper divisors (1061721077780).

2123442155554 is a wasteful number, since it uses less digits than its factorization.

2123442155554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061721077779.

The product of its digits is 960000, while the sum is 43.

Adding to 2123442155554 its reverse (4555512443212), we get a palindrome (6678954598766).

The spelling of 2123442155554 in words is "two trillion, one hundred twenty-three billion, four hundred forty-two million, one hundred fifty-five thousand, five hundred fifty-four".