36661421 has 4 divisors (see below), whose sum is σ = 37555644. Its totient is φ = 35767200.

The previous prime is 36661409. The next prime is 36661433. The reversal of 36661421 is 12416663.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (36661409) and next prime (36661433).

It can be written as a sum of positive squares in 2 ways, for example, as 21058921 + 15602500 = 4589^2 + 3950^2 .

It is a cyclic number.

It is not a de Polignac number, because 36661421 - 2⁶ = 36661357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36661021) 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, 447050 + ... + 447131.

It is an arithmetic number, because the mean of its divisors is an integer number (9388911).

Almost surely, 2^36661421 is an apocalyptic number.

It is an amenable number.

36661421 is a deficient number, since it is larger than the sum of its proper divisors (894223).

36661421 is an equidigital number, since it uses as much as digits as its factorization.

36661421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894222.

The product of its digits is 5184, while the sum is 29.

The square root of 36661421 is about 6054.8675460327. The cubic root of 36661421 is about 332.2026542532.

The spelling of 36661421 in words is "thirty-six million, six hundred sixty-one thousand, four hundred twenty-one".