212004649 has 4 divisors (see below), whose sum is σ = 212033920. Its totient is φ = 211975380.

The previous prime is 212004647. The next prime is 212004701. The reversal of 212004649 is 946400212.

212004649 = T₁₁₈₈₇ + T₁₁₈₈₈ + T₁₁₈₈₉.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 212004649 - 2¹ = 212004647 is a prime.

It is a super-2 number, since 2×212004649² = 89891942395226402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212004647) 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, 5104 + ... + 21214.

It is an arithmetic number, because the mean of its divisors is an integer number (53008480).

Almost surely, 2^212004649 is an apocalyptic number.

212004649 is the 11889-th centered triangular number.

It is an amenable number.

212004649 is a deficient number, since it is larger than the sum of its proper divisors (29271).

212004649 is a wasteful number, since it uses less digits than its factorization.

212004649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29270.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 212004649 is about 14560.3794250013. The cubic root of 212004649 is about 596.2775543496.

The spelling of 212004649 in words is "two hundred twelve million, four thousand, six hundred forty-nine".