21420213032 has 16 divisors (see below), whose sum is σ = 40329554100. Its totient is φ = 10665665280.

The previous prime is 21420212981. The next prime is 21420213043. The reversal of 21420213032 is 23031202412.

It can be written as a sum of positive squares in 2 ways, for example, as 21358653316 + 61559716 = 146146^2 + 7846^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21420212995 and 21420213013.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5553107 + ... + 5556962.

Almost surely, 2^21420213032 is an apocalyptic number.

It is an amenable number.

21420213032 is a deficient number, since it is larger than the sum of its proper divisors (18909341068).

21420213032 is a wasteful number, since it uses less digits than its factorization.

21420213032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11110316 (or 11110312 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21420213032 its reverse (23031202412), we get a palindrome (44451415444).

The spelling of 21420213032 in words is "twenty-one billion, four hundred twenty million, two hundred thirteen thousand, thirty-two".