213165547940 has 24 divisors (see below), whose sum is σ = 447664207032. Its totient is φ = 85263065600.

The previous prime is 213165547921. The next prime is 213165547949. The reversal of 213165547940 is 49745561312.

It is a happy number.

213165547940 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9230213476 + 203935334464 = 96074^2 + 451592^2 .

It is not an unprimeable number, because it can be changed into a prime (213165547949) 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, 401522 + ... + 766518.

It is an arithmetic number, because the mean of its divisors is an integer number (18652675293).

Almost surely, 2^213165547940 is an apocalyptic number.

213165547940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213165547940 is an abundant number, since it is smaller than the sum of its proper divisors (234498659092).

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

213165547940 is a wasteful number, since it uses less digits than its factorization.

213165547940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394207 (or 394205 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 213165547940 in words is "two hundred thirteen billion, one hundred sixty-five million, five hundred forty-seven thousand, nine hundred forty".