212403551 has 6 divisors (see below), whose sum is σ = 222040560. Its totient is φ = 203168108.

The previous prime is 212403547. The next prime is 212403553. The reversal of 212403551 is 155304212.

212403551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212403551 - 2² = 212403547 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212403553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 200231 + ... + 201288.

It is an arithmetic number, because the mean of its divisors is an integer number (37006760).

Almost surely, 2^212403551 is an apocalyptic number.

212403551 is a deficient number, since it is larger than the sum of its proper divisors (9637009).

212403551 is an equidigital number, since it uses as much as digits as its factorization.

212403551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401565 (or 401542 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 212403551 is about 14574.0711882439. The cubic root of 212403551 is about 596.6512997440.

Adding to 212403551 its reverse (155304212), we get a palindrome (367707763).

The spelling of 212403551 in words is "two hundred twelve million, four hundred three thousand, five hundred fifty-one".