221894037 has 6 divisors (see below), whose sum is σ = 320513622. Its totient is φ = 147929352.

The previous prime is 221894011. The next prime is 221894083. The reversal of 221894037 is 730498122.

It can be written as a sum of positive squares in only one way, i.e., 212401476 + 9492561 = 14574^2 + 3081^2 .

It is not a de Polignac number, because 221894037 - 2¹⁰ = 221893013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221893992 and 221894010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221894137) 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, 12327438 + ... + 12327455.

It is an arithmetic number, because the mean of its divisors is an integer number (53418937).

Almost surely, 2^221894037 is an apocalyptic number.

It is an amenable number.

221894037 is a deficient number, since it is larger than the sum of its proper divisors (98619585).

221894037 is a wasteful number, since it uses less digits than its factorization.

221894037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24654899 (or 24654896 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 221894037 is about 14896.1081158805. The cubic root of 221894037 is about 605.4085413086.

The spelling of 221894037 in words is "two hundred twenty-one million, eight hundred ninety-four thousand, thirty-seven".