212721474 has 32 divisors (see below), whose sum is σ = 486660096. Its totient is φ = 60722640.

The previous prime is 212721469. The next prime is 212721479. The reversal of 212721474 is 474127212.

It is an interprime number because it is at equal distance from previous prime (212721469) and next prime (212721479).

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212721479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77229 + ... + 79935.

It is an arithmetic number, because the mean of its divisors is an integer number (15208128).

Almost surely, 2^212721474 is an apocalyptic number.

212721474 is an abundant number, since it is smaller than the sum of its proper divisors (273938622).

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

212721474 is a wasteful number, since it uses less digits than its factorization.

212721474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4590.

The product of its digits is 6272, while the sum is 30.

The square root of 212721474 is about 14584.9742543482. The cubic root of 212721474 is about 596.9488380972.

Adding to 212721474 its reverse (474127212), we get a palindrome (686848686).

The spelling of 212721474 in words is "two hundred twelve million, seven hundred twenty-one thousand, four hundred seventy-four".