21122030105 has 64 divisors (see below), whose sum is σ = 30506803200. Its totient is φ = 13858225920.

The previous prime is 21122030099. The next prime is 21122030113. The reversal of 21122030105 is 50103022112.

It is a happy number.

It is not a de Polignac number, because 21122030105 - 2²² = 21117835801 is a prime.

It is a super-2 number, since 2×21122030105² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5742527 + ... + 5746203.

It is an arithmetic number, because the mean of its divisors is an integer number (476668800).

Almost surely, 2^21122030105 is an apocalyptic number.

It is an amenable number.

21122030105 is a deficient number, since it is larger than the sum of its proper divisors (9384773095).

21122030105 is a wasteful number, since it uses less digits than its factorization.

21122030105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3974.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 21122030105 its reverse (50103022112), we get a palindrome (71225052217).

The spelling of 21122030105 in words is "twenty-one billion, one hundred twenty-two million, thirty thousand, one hundred five".