21000222234 has 12 divisors (see below), whose sum is σ = 45500481546. Its totient is φ = 7000074072.

The previous prime is 21000222227. The next prime is 21000222241. The reversal of 21000222234 is 43222200012.

21000222234 is a `hidden beast` number, since 210 + 0 + 0 + 222 + 234 = 666.

It is an interprime number because it is at equal distance from previous prime (21000222227) and next prime (21000222241).

It can be written as a sum of positive squares in only one way, i.e., 12487392009 + 8512830225 = 111747^2 + 92265^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1166679013 = 21000222234 / (2 + 1 + 0 + 0 + 0 + 2 + 2 + 2 + 2 + 3 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 583339489 + ... + 583339524.

Almost surely, 2^21000222234 is an apocalyptic number.

21000222234 is an abundant number, since it is smaller than the sum of its proper divisors (24500259312).

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

21000222234 is a wasteful number, since it uses less digits than its factorization.

21000222234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166679021 (or 1166679018 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21000222234 its reverse (43222200012), we get a palindrome (64222422246).

The spelling of 21000222234 in words is "twenty-one billion, two hundred twenty-two thousand, two hundred thirty-four".