2221701651 has 24 divisors (see below), whose sum is σ = 3469795056. Its totient is φ = 1361736000.

The previous prime is 2221701641. The next prime is 2221701659. The reversal of 2221701651 is 1561071222.

2221701651 is a `hidden beast` number, since 2 + 2 + 2 + 1 + 7 + 0 + 1 + 651 = 666.

It is not a de Polignac number, because 2221701651 - 2⁵ = 2221701619 is a prime.

It is a super-2 number, since 2×2221701651² = 9871916452112251602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2221701659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8460 + ... + 67193.

It is an arithmetic number, because the mean of its divisors is an integer number (144574794).

Almost surely, 2^2221701651 is an apocalyptic number.

2221701651 is a deficient number, since it is larger than the sum of its proper divisors (1248093405).

2221701651 is a wasteful number, since it uses less digits than its factorization.

2221701651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75923 (or 75920 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 2221701651 is about 47134.9302640833. The cubic root of 2221701651 is about 1304.8539740601.

Adding to 2221701651 its reverse (1561071222), we get a palindrome (3782772873).

The spelling of 2221701651 in words is "two billion, two hundred twenty-one million, seven hundred one thousand, six hundred fifty-one".