213143431440 has 80 divisors (see below), whose sum is σ = 661756984128. Its totient is φ = 56751164928.

The previous prime is 213143431427. The next prime is 213143431481. The reversal of 213143431440 is 44134341312.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 213143431398 and 213143431407.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 523294 + ... + 836733.

Almost surely, 2^213143431440 is an apocalyptic number.

213143431440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213143431440 is an abundant number, since it is smaller than the sum of its proper divisors (448613552688).

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

213143431440 is a wasteful number, since it uses less digits than its factorization.

213143431440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360696 (or 1360690 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 213143431440 its reverse (44134341312), we get a palindrome (257277772752).

The spelling of 213143431440 in words is "two hundred thirteen billion, one hundred forty-three million, four hundred thirty-one thousand, four hundred forty".