21522062121 has 8 divisors (see below), whose sum is σ = 32795523264. Its totient is φ = 12298321200.

The previous prime is 21522061997. The next prime is 21522062123. The reversal of 21522062121 is 12126022512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21522062121 - 2⁷ = 21522061993 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21522062091 and 21522062100.

It is not an unprimeable number, because it can be changed into a prime (21522062123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512430030 + ... + 512430071.

It is an arithmetic number, because the mean of its divisors is an integer number (4099440408).

Almost surely, 2^21522062121 is an apocalyptic number.

21522062121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21522062121 is a deficient number, since it is larger than the sum of its proper divisors (11273461143).

21522062121 is a wasteful number, since it uses less digits than its factorization.

21522062121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024860111.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21522062121 its reverse (12126022512), we get a palindrome (33648084633).

The spelling of 21522062121 in words is "twenty-one billion, five hundred twenty-two million, sixty-two thousand, one hundred twenty-one".