213521250433501 has 4 divisors (see below), whose sum is σ = 213521331163392. Its totient is φ = 213521169703612.

The previous prime is 213521250433499. The next prime is 213521250433529. The reversal of 213521250433501 is 105334052125312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213521250433501 - 2¹ = 213521250433499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213521250433201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36258355 + ... + 41733808.

It is an arithmetic number, because the mean of its divisors is an integer number (53380332790848).

Almost surely, 2^{213521250433501} is an apocalyptic number.

It is an amenable number.

213521250433501 is a deficient number, since it is larger than the sum of its proper divisors (80729891).

213521250433501 is an equidigital number, since it uses as much as digits as its factorization.

213521250433501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80729890.

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 213521250433501 in words is "two hundred thirteen trillion, five hundred twenty-one billion, two hundred fifty million, four hundred thirty-three thousand, five hundred one".