1000251221 has 8 divisors (see below), whose sum is σ = 1017420000. Its totient is φ = 983107440.

The previous prime is 1000251179. The next prime is 1000251223. The reversal of 1000251221 is 1221520001.

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 1000251221 - 2⁶ = 1000251157 is a prime.

It is a super-2 number, since 2×1000251221² = 2001005010223981682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000251196 and 1000251205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000251223) 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, 85970 + ... + 96908.

It is an arithmetic number, because the mean of its divisors is an integer number (127177500).

Almost surely, 2^1000251221 is an apocalyptic number.

It is an amenable number.

1000251221 is a deficient number, since it is larger than the sum of its proper divisors (17168779).

1000251221 is a wasteful number, since it uses less digits than its factorization.

1000251221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12499.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 1000251221 is about 31626.7485050234. The cubic root of 1000251221 is about 1000.0837333219.

Adding to 1000251221 its reverse (1221520001), we get a palindrome (2221771222).

The spelling of 1000251221 in words is "one billion, two hundred fifty-one thousand, two hundred twenty-one".