1221132101 has 16 divisors (see below), whose sum is σ = 1425105024. Its totient is φ = 1024752384.

The previous prime is 1221132041. The next prime is 1221132113. The reversal of 1221132101 is 1012311221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221132101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221132131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61286 + ... + 78728.

It is an arithmetic number, because the mean of its divisors is an integer number (89069064).

Almost surely, 2^1221132101 is an apocalyptic number.

It is an amenable number.

1221132101 is a deficient number, since it is larger than the sum of its proper divisors (203972923).

1221132101 is a wasteful number, since it uses less digits than its factorization.

1221132101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17660.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1221132101 is about 34944.7006139701. The cubic root of 1221132101 is about 1068.8601426059.

Adding to 1221132101 its reverse (1012311221), we get a palindrome (2233443322).

The spelling of 1221132101 in words is "one billion, two hundred twenty-one million, one hundred thirty-two thousand, one hundred one".