1221427101 has 16 divisors (see below), whose sum is σ = 1737540288. Its totient is φ = 760531200.

The previous prime is 1221427079. The next prime is 1221427111. The reversal of 1221427101 is 1017241221.

It is not a de Polignac number, because 1221427101 - 2¹³ = 1221418909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221427111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84730 + ... + 98091.

It is an arithmetic number, because the mean of its divisors is an integer number (108596268).

Almost surely, 2^1221427101 is an apocalyptic number.

It is an amenable number.

1221427101 is a deficient number, since it is larger than the sum of its proper divisors (516113187).

1221427101 is a wasteful number, since it uses less digits than its factorization.

1221427101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182972.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 1221427101 is about 34948.9213138260. The cubic root of 1221427101 is about 1068.9462071014.

Adding to 1221427101 its reverse (1017241221), we get a palindrome (2238668322).

The spelling of 1221427101 in words is "one billion, two hundred twenty-one million, four hundred twenty-seven thousand, one hundred one".