1221299051 has 8 divisors (see below), whose sum is σ = 1396253664. Its totient is φ = 1046465280.

The previous prime is 1221299047. The next prime is 1221299077. The reversal of 1221299051 is 1509921221.

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

It is not a de Polignac number, because 1221299051 - 2² = 1221299047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221298999 and 1221299017.

It is not an unprimeable number, because it can be changed into a prime (1221299041) 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, 7400 + ... + 49973.

It is an arithmetic number, because the mean of its divisors is an integer number (174531708).

Almost surely, 2^1221299051 is an apocalyptic number.

1221299051 is a deficient number, since it is larger than the sum of its proper divisors (174954613).

1221299051 is an equidigital number, since it uses as much as digits as its factorization.

1221299051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60421.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 1221299051 is about 34947.0893065503. The cubic root of 1221299051 is about 1068.9088509777.

The spelling of 1221299051 in words is "one billion, two hundred twenty-one million, two hundred ninety-nine thousand, fifty-one".