2121240554456 has 8 divisors (see below), whose sum is σ = 3977326039620. Its totient is φ = 1060620277224.

The previous prime is 2121240554423. The next prime is 2121240554501. The reversal of 2121240554456 is 6544550421212.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×2121240554456² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132577534646 + ... + 132577534661.

Almost surely, 2^{2121240554456} is an apocalyptic number.

It is an amenable number.

2121240554456 is a deficient number, since it is larger than the sum of its proper divisors (1856085485164).

2121240554456 is a wasteful number, since it uses less digits than its factorization.

2121240554456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265155069313 (or 265155069309 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 41.

Adding to 2121240554456 its reverse (6544550421212), we get a palindrome (8665790975668).

The spelling of 2121240554456 in words is "two trillion, one hundred twenty-one billion, two hundred forty million, five hundred fifty-four thousand, four hundred fifty-six".