21403220230570 has 8 divisors (see below), whose sum is σ = 38525796415044. Its totient is φ = 8561288092224.

The previous prime is 21403220230537. The next prime is 21403220230571. The reversal of 21403220230570 is 7503202230412.

It can be written as a sum of positive squares in 2 ways, for example, as 20072272683681 + 1330947546889 = 4480209^2 + 1153667^2 .

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 (21403220230571) 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, 1070161011519 + ... + 1070161011538.

Almost surely, 2^{21403220230570} is an apocalyptic number.

21403220230570 is a deficient number, since it is larger than the sum of its proper divisors (17122576184474).

21403220230570 is a wasteful number, since it uses less digits than its factorization.

21403220230570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140322023064.

The product of its (nonzero) digits is 20160, while the sum is 31.

Adding to 21403220230570 its reverse (7503202230412), we get a palindrome (28906422460982).

The spelling of 21403220230570 in words is "twenty-one trillion, four hundred three billion, two hundred twenty million, two hundred thirty thousand, five hundred seventy".