126153221 has 4 divisors (see below), whose sum is σ = 127310700. Its totient is φ = 124995744.

The previous prime is 126153211. The next prime is 126153233. The reversal of 126153221 is 122351621.

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

It can be written as a sum of positive squares in 2 ways, for example, as 81450625 + 44702596 = 9025^2 + 6686^2 .

It is a cyclic number.

It is not a de Polignac number, because 126153221 - 2²⁶ = 59044357 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 (126153211) 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, 578576 + ... + 578793.

It is an arithmetic number, because the mean of its divisors is an integer number (31827675).

Almost surely, 2^126153221 is an apocalyptic number.

It is an amenable number.

126153221 is a deficient number, since it is larger than the sum of its proper divisors (1157479).

126153221 is a wasteful number, since it uses less digits than its factorization.

126153221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157478.

The product of its digits is 720, while the sum is 23.

The square root of 126153221 is about 11231.7950925041. The cubic root of 126153221 is about 501.5329234883.

The spelling of 126153221 in words is "one hundred twenty-six million, one hundred fifty-three thousand, two hundred twenty-one".