121522204211521 has 27 divisors (see below), whose sum is σ = 126476797651113. Its totient is φ = 116759619324480.

The previous prime is 121522204211501. The next prime is 121522204211539. The reversal of 121522204211521 is 125112402225121.

The square root of 121522204211521 is 11023711.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 4427384098225 + 117094820113296 = 2104135^2 + 10821036^2 .

It is not a de Polignac number, because 121522204211521 - 2³¹ = 121520056727873 is a prime.

It is a super-2 number, since 2×121522204211521² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121522204211501) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 30282132111 + ... + 30282136123.

Almost surely, 2^{121522204211521} is an apocalyptic number.

121522204211521 is the 11023711-st square number.

121522204211521 is the 5511856-th centered octagonal number.

It is an amenable number.

121522204211521 is a deficient number, since it is larger than the sum of its proper divisors (4954593439592).

121522204211521 is an frugal number, since it uses more digits than its factorization.

121522204211521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8242 (or 4121 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

Adding to 121522204211521 its reverse (125112402225121), we get a palindrome (246634606436642).

The spelling of 121522204211521 in words is "one hundred twenty-one trillion, five hundred twenty-two billion, two hundred four million, two hundred eleven thousand, five hundred twenty-one".