102121222111221 has 16 divisors (see below), whose sum is σ = 139910595305600. Its totient is φ = 66208145560128.

The previous prime is 102121222111127. The next prime is 102121222111241. The reversal of 102121222111221 is 122111222121201.

It is not a de Polignac number, because 102121222111221 - 2¹¹ = 102121222109173 is a prime.

It is a super-2 number, since 2×102121222111221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121222111241) 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, 226490161 + ... + 226940598.

It is an arithmetic number, because the mean of its divisors is an integer number (8744412206600).

Almost surely, 2^{102121222111221} is an apocalyptic number.

It is an amenable number.

102121222111221 is a deficient number, since it is larger than the sum of its proper divisors (37789373194379).

102121222111221 is a wasteful number, since it uses less digits than its factorization.

102121222111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453432828.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 102121222111221 its reverse (122111222121201), we get a palindrome (224232444232422).

The spelling of 102121222111221 in words is "one hundred two trillion, one hundred twenty-one billion, two hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".