213551513540 has 24 divisors (see below), whose sum is σ = 448508117400. Its totient is φ = 85411093248.

The previous prime is 213551513537. The next prime is 213551513543. The reversal of 213551513540 is 45315155312.

It is an interprime number because it is at equal distance from previous prime (213551513537) and next prime (213551513543).

It can be written as a sum of positive squares in 4 ways, for example, as 4746383236 + 208805130304 = 68894^2 + 456952^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 213551513540.

It is not an unprimeable number, because it can be changed into a prime (213551513543) 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, 409007 + ... + 770966.

It is an arithmetic number, because the mean of its divisors is an integer number (18687838225).

Almost surely, 2^213551513540 is an apocalyptic number.

213551513540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213551513540 is an abundant number, since it is smaller than the sum of its proper divisors (234956603860).

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

213551513540 is a wasteful number, since it uses less digits than its factorization.

213551513540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189031 (or 1189029 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 35.

Adding to 213551513540 its reverse (45315155312), we get a palindrome (258866668852).

The spelling of 213551513540 in words is "two hundred thirteen billion, five hundred fifty-one million, five hundred thirteen thousand, five hundred forty".