21004212410 has 16 divisors (see below), whose sum is σ = 37930739616. Its totient is φ = 8374316688.

The previous prime is 21004212391. The next prime is 21004212413. The reversal of 21004212410 is 1421240012.

It is not an unprimeable number, because it can be changed into a prime (21004212413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3417812 + ... + 3423951.

It is an arithmetic number, because the mean of its divisors is an integer number (2370671226).

Almost surely, 2^21004212410 is an apocalyptic number.

21004212410 is a deficient number, since it is larger than the sum of its proper divisors (16926527206).

21004212410 is a wasteful number, since it uses less digits than its factorization.

21004212410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6842077.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21004212410 its reverse (1421240012), we get a palindrome (22425452422).

The spelling of 21004212410 in words is "twenty-one billion, four million, two hundred twelve thousand, four hundred ten".