212545403 has 4 divisors (see below), whose sum is σ = 242909040. Its totient is φ = 182181768.

The previous prime is 212545391. The next prime is 212545469. The reversal of 212545403 is 304545212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212545403 - 2¹⁶ = 212479867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212545483) 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, 15181808 + ... + 15181821.

It is an arithmetic number, because the mean of its divisors is an integer number (60727260).

Almost surely, 2^212545403 is an apocalyptic number.

212545403 is a deficient number, since it is larger than the sum of its proper divisors (30363637).

212545403 is an equidigital number, since it uses as much as digits as its factorization.

212545403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30363636.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 212545403 is about 14578.9369639902. The cubic root of 212545403 is about 596.7840931076.

The spelling of 212545403 in words is "two hundred twelve million, five hundred forty-five thousand, four hundred three".