21421204030 has 32 divisors (see below), whose sum is σ = 39064615200. Its totient is φ = 8456672640.

The previous prime is 21421204027. The next prime is 21421204037. The reversal of 21421204030 is 3040212412.

It is a junction number, because it is equal to n+sod(n) for n = 21421203989 and 21421204007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421204037) 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, 188145 + ... + 279715.

It is an arithmetic number, because the mean of its divisors is an integer number (1220769225).

Almost surely, 2^21421204030 is an apocalyptic number.

21421204030 is a deficient number, since it is larger than the sum of its proper divisors (17643411170).

21421204030 is a wasteful number, since it uses less digits than its factorization.

21421204030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91884.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21421204030 its reverse (3040212412), we get a palindrome (24461416442).

The spelling of 21421204030 in words is "twenty-one billion, four hundred twenty-one million, two hundred four thousand, thirty".