213939121272828 has 72 divisors (see below), whose sum is σ = 580705721611344. Its totient is φ = 61124008377600.

The previous prime is 213939121272739. The next prime is 213939121272829. The reversal of 213939121272828 is 828272121939312.

It is a super-2 number, since 2×213939121272828² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213939121272829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20517168 + ... + 29134728.

It is an arithmetic number, because the mean of its divisors is an integer number (8065357244602).

Almost surely, 2^{213939121272828} is an apocalyptic number.

213939121272828 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

213939121272828 is an abundant number, since it is smaller than the sum of its proper divisors (366766600338516).

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

213939121272828 is a wasteful number, since it uses less digits than its factorization.

213939121272828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8659803 (or 8659794 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 60.

The spelling of 213939121272828 in words is "two hundred thirteen trillion, nine hundred thirty-nine billion, one hundred twenty-one million, two hundred seventy-two thousand, eight hundred twenty-eight".