21342021224 has 16 divisors (see below), whose sum is σ = 40017840900. Its totient is φ = 10670596992.

The previous prime is 21342021209. The next prime is 21342021227. The reversal of 21342021224 is 42212024312.

It can be written as a sum of positive squares in 2 ways, for example, as 21117321124 + 224700100 = 145318^2 + 14990^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21342021224.

It is not an unprimeable number, because it can be changed into a prime (21342021227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367934 + ... + 421970.

Almost surely, 2^21342021224 is an apocalyptic number.

It is an amenable number.

21342021224 is a deficient number, since it is larger than the sum of its proper divisors (18675819676).

21342021224 is a wasteful number, since it uses less digits than its factorization.

21342021224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103412 (or 103408 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21342021224 its reverse (42212024312), we get a palindrome (63554045536).

The spelling of 21342021224 in words is "twenty-one billion, three hundred forty-two million, twenty-one thousand, two hundred twenty-four".