21416121522 has 20 divisors (see below), whose sum is σ = 47987976366. Its totient is φ = 7138707120.

The previous prime is 21416121479. The next prime is 21416121539. The reversal of 21416121522 is 22512161412.

It is a happy number.

21416121522 is a `hidden beast` number, since 2 + 1 + 4 + 16 + 121 + 522 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17169122961 + 4246998561 = 131031^2 + 65169^2 .

It is a super-2 number, since 2×21416121522² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 66098979 + ... + 66099302.

Almost surely, 2^21416121522 is an apocalyptic number.

21416121522 is an abundant number, since it is smaller than the sum of its proper divisors (26571854844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21416121522 is a wasteful number, since it uses less digits than its factorization.

21416121522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132198295 (or 132198286 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

Adding to 21416121522 its reverse (22512161412), we get a palindrome (43928282934).

The spelling of 21416121522 in words is "twenty-one billion, four hundred sixteen million, one hundred twenty-one thousand, five hundred twenty-two".