5151361221 has 12 divisors (see below), whose sum is σ = 7764370848. Its totient is φ = 3284925864.

The previous prime is 5151361217. The next prime is 5151361231. The reversal of 5151361221 is 1221631515.

5151361221 is a `hidden beast` number, since 5 + 15 + 13 + 612 + 21 = 666.

It is not a de Polignac number, because 5151361221 - 2² = 5151361217 is a prime.

It is a super-2 number, since 2×5151361221² = 53073044858445221682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5151361211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12442695 + ... + 12443108.

It is an arithmetic number, because the mean of its divisors is an integer number (647030904).

Almost surely, 2^5151361221 is an apocalyptic number.

It is an amenable number.

5151361221 is a deficient number, since it is larger than the sum of its proper divisors (2613009627).

5151361221 is a wasteful number, since it uses less digits than its factorization.

5151361221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24885832 (or 24885829 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 5151361221 is about 71772.9839215286. The cubic root of 5151361221 is about 1727.0596383776.

Adding to 5151361221 its reverse (1221631515), we get a palindrome (6372992736).

The spelling of 5151361221 in words is "five billion, one hundred fifty-one million, three hundred sixty-one thousand, two hundred twenty-one".