21019304212 has 6 divisors (see below), whose sum is σ = 36783782378. Its totient is φ = 10509652104.

The previous prime is 21019304179. The next prime is 21019304221. The reversal of 21019304212 is 21240391012.

It can be written as a sum of positive squares in only one way, i.e., 13031592336 + 7987711876 = 114156^2 + 89374^2 .

It is a super-2 number, since 2×21019304212² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2627413023 + ... + 2627413030.

Almost surely, 2^21019304212 is an apocalyptic number.

It is an amenable number.

21019304212 is a deficient number, since it is larger than the sum of its proper divisors (15764478166).

21019304212 is a wasteful number, since it uses less digits than its factorization.

21019304212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5254826057 (or 5254826055 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 21019304212 its reverse (21240391012), we get a palindrome (42259695224).

The spelling of 21019304212 in words is "twenty-one billion, nineteen million, three hundred four thousand, two hundred twelve".