2123451329820 has 24 divisors (see below), whose sum is σ = 5945663723664. Its totient is φ = 566253687936.

The previous prime is 2123451329771. The next prime is 2123451329837. The reversal of 2123451329820 is 289231543212.

It is a super-2 number, since 2×2123451329820² (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 in 7 ways as a sum of consecutive naturals, for example, 17695427689 + ... + 17695427808.

It is an arithmetic number, because the mean of its divisors is an integer number (247735988486).

Almost surely, 2^{2123451329820} is an apocalyptic number.

2123451329820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2123451329820 is an abundant number, since it is smaller than the sum of its proper divisors (3822212393844).

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

2123451329820 is a wasteful number, since it uses less digits than its factorization.

2123451329820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35390855509 (or 35390855507 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 2123451329820 in words is "two trillion, one hundred twenty-three billion, four hundred fifty-one million, three hundred twenty-nine thousand, eight hundred twenty".