612051221 has 4 divisors (see below), whose sum is σ = 648054252. Its totient is φ = 576048192.

The previous prime is 612051179. The next prime is 612051281. The reversal of 612051221 is 122150216.

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 505755121 + 106296100 = 22489^2 + 10310^2 .

It is a cyclic number.

It is not a de Polignac number, because 612051221 - 2¹⁸ = 611789077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 612051193 and 612051202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612051281) 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, 18001490 + ... + 18001523.

It is an arithmetic number, because the mean of its divisors is an integer number (162013563).

Almost surely, 2^612051221 is an apocalyptic number.

It is an amenable number.

612051221 is a deficient number, since it is larger than the sum of its proper divisors (36003031).

612051221 is a wasteful number, since it uses less digits than its factorization.

612051221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36003030.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 612051221 is about 24739.6689751500. The cubic root of 612051221 is about 849.0421602600.

It can be divided in two parts, 61205 and 1221, that added together give a palindrome (62426).

The spelling of 612051221 in words is "six hundred twelve million, fifty-one thousand, two hundred twenty-one".