213921649788 has 48 divisors (see below), whose sum is σ = 622317529344. Its totient is φ = 55564064640.

The previous prime is 213921649757. The next prime is 213921649789. The reversal of 213921649788 is 887946129312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213921649789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115757545 + ... + 115759392.

It is an arithmetic number, because the mean of its divisors is an integer number (12964948528).

Almost surely, 2^213921649788 is an apocalyptic number.

213921649788 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

213921649788 is an abundant number, since it is smaller than the sum of its proper divisors (408395879556).

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

213921649788 is a wasteful number, since it uses less digits than its factorization.

213921649788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231516962 (or 231516960 counting only the distinct ones).

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

The spelling of 213921649788 in words is "two hundred thirteen billion, nine hundred twenty-one million, six hundred forty-nine thousand, seven hundred eighty-eight".