213206656542 has 64 divisors (see below), whose sum is σ = 483407308800. Its totient is φ = 62104233600.

The previous prime is 213206656529. The next prime is 213206656567. The reversal of 213206656542 is 245656602312.

It is a junction number, because it is equal to n+sod(n) for n = 213206656494 and 213206656503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44833 + ... + 654540.

It is an arithmetic number, because the mean of its divisors is an integer number (7553239200).

Almost surely, 2^213206656542 is an apocalyptic number.

213206656542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

213206656542 is an abundant number, since it is smaller than the sum of its proper divisors (270200652258).

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

213206656542 is a wasteful number, since it uses less digits than its factorization.

213206656542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699569.

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 213206656542 in words is "two hundred thirteen billion, two hundred six million, six hundred fifty-six thousand, five hundred forty-two".