101621221221 has 24 divisors (see below), whose sum is σ = 149088464224. Its totient is φ = 61205528160.

The previous prime is 101621221201. The next prime is 101621221253. The reversal of 101621221221 is 122122126101.

It is not a de Polignac number, because 101621221221 - 2¹⁴ = 101621204837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101621221201) 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 23 ways as a sum of consecutive naturals, for example, 503635 + ... + 675936.

Almost surely, 2^101621221221 is an apocalyptic number.

It is an amenable number.

101621221221 is a deficient number, since it is larger than the sum of its proper divisors (47467243003).

101621221221 is a wasteful number, since it uses less digits than its factorization.

101621221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179681 (or 1179634 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 101621221221 its reverse (122122126101), we get a palindrome (223743347322).

The spelling of 101621221221 in words is "one hundred one billion, six hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".