212402661 has 8 divisors (see below), whose sum is σ = 283668000. Its totient is φ = 141369552.

The previous prime is 212402647. The next prime is 212402689. The reversal of 212402661 is 166204212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212402661 - 2¹⁴ = 212386277 is a prime.

It is a super-2 number, since 2×212402661² = 90229780799761842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212402611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55911 + ... + 59588.

It is an arithmetic number, because the mean of its divisors is an integer number (35458500).

Almost surely, 2^212402661 is an apocalyptic number.

It is an amenable number.

212402661 is a deficient number, since it is larger than the sum of its proper divisors (71265339).

212402661 is a wasteful number, since it uses less digits than its factorization.

212402661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116115.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 212402661 is about 14574.0406545337. The cubic root of 212402661 is about 596.6504663926.

Adding to 212402661 its reverse (166204212), we get a palindrome (378606873).

The spelling of 212402661 in words is "two hundred twelve million, four hundred two thousand, six hundred sixty-one".