1221060651 has 8 divisors (see below), whose sum is σ = 1639794240. Its totient is φ = 808183752.

The previous prime is 1221060641. The next prime is 1221060661. The reversal of 1221060651 is 1560601221.

It is an interprime number because it is at equal distance from previous prime (1221060641) and next prime (1221060661).

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

It is not a de Polignac number, because 1221060651 - 2⁷ = 1221060523 is a prime.

It is a super-2 number, since 2×1221060651² = 2981978226841087602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221060641) 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, 1463685 + ... + 1464518.

It is an arithmetic number, because the mean of its divisors is an integer number (204974280).

Almost surely, 2^1221060651 is an apocalyptic number.

1221060651 is a deficient number, since it is larger than the sum of its proper divisors (418733589).

1221060651 is a wasteful number, since it uses less digits than its factorization.

1221060651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2928345.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1221060651 is about 34943.6782694667. The cubic root of 1221060651 is about 1068.8392954083.

Adding to 1221060651 its reverse (1560601221), we get a palindrome (2781661872).

The spelling of 1221060651 in words is "one billion, two hundred twenty-one million, sixty thousand, six hundred fifty-one".