21120222030 has 32 divisors (see below), whose sum is σ = 51382901664. Its totient is φ = 5554907136.

The previous prime is 21120222023. The next prime is 21120222037. The reversal of 21120222030 is 3022202112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21120222023) and next prime (21120222037).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120222037) 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, 4819779 + ... + 4824158.

It is an arithmetic number, because the mean of its divisors is an integer number (1605715677).

Almost surely, 2^21120222030 is an apocalyptic number.

21120222030 is an abundant number, since it is smaller than the sum of its proper divisors (30262679634).

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

21120222030 is a wasteful number, since it uses less digits than its factorization.

21120222030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9644020.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21120222030 its reverse (3022202112), we get a palindrome (24142424142).

The spelling of 21120222030 in words is "twenty-one billion, one hundred twenty million, two hundred twenty-two thousand, thirty".