2121555543132 has 24 divisors (see below), whose sum is σ = 4950320368896. Its totient is φ = 707181737968.

The previous prime is 2121555543091. The next prime is 2121555543137. The reversal of 2121555543132 is 2313455551212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121555543137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3801403 + ... + 4323629.

It is an arithmetic number, because the mean of its divisors is an integer number (206263348704).

Almost surely, 2^{2121555543132} is an apocalyptic number.

It is an amenable number.

2121555543132 is an abundant number, since it is smaller than the sum of its proper divisors (2828764825764).

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

2121555543132 is a wasteful number, since it uses less digits than its factorization.

2121555543132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860777 (or 860775 counting only the distinct ones).

The product of its digits is 180000, while the sum is 39.

The spelling of 2121555543132 in words is "two trillion, one hundred twenty-one billion, five hundred fifty-five million, five hundred forty-three thousand, one hundred thirty-two".