21219134890 has 8 divisors (see below), whose sum is σ = 38194442820. Its totient is φ = 8487653952.

The previous prime is 21219134861. The next prime is 21219134891. The reversal of 21219134890 is 9843191212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18681695761 + 2537439129 = 136681^2 + 50373^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21219134891) 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, 1060956735 + ... + 1060956754.

Almost surely, 2^21219134890 is an apocalyptic number.

21219134890 is a deficient number, since it is larger than the sum of its proper divisors (16975307930).

21219134890 is a wasteful number, since it uses less digits than its factorization.

21219134890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121913496.

The product of its (nonzero) digits is 31104, while the sum is 40.

The spelling of 21219134890 in words is "twenty-one billion, two hundred nineteen million, one hundred thirty-four thousand, eight hundred ninety".