1057651221 has 8 divisors (see below), whose sum is σ = 1538401824. Its totient is φ = 641000720.

The previous prime is 1057651201. The next prime is 1057651223. The reversal of 1057651221 is 1221567501.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1057651221 - 2¹³ = 1057643029 is a prime.

It is a super-2 number, since 2×1057651221² = 2237252210565581682, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1057651223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16024986 + ... + 16025051.

It is an arithmetic number, because the mean of its divisors is an integer number (192300228).

Almost surely, 2^1057651221 is an apocalyptic number.

1057651221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1057651221 is a deficient number, since it is larger than the sum of its proper divisors (480750603).

1057651221 is a wasteful number, since it uses less digits than its factorization.

1057651221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32050051.

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 1057651221 is about 32521.5501014327. The cubic root of 1057651221 is about 1018.8591695222.

The spelling of 1057651221 in words is "one billion, fifty-seven million, six hundred fifty-one thousand, two hundred twenty-one".