21420322112 has 56 divisors (see below), whose sum is σ = 48595117440. Its totient is φ = 9176947200.

The previous prime is 21420322057. The next prime is 21420322117. The reversal of 21420322112 is 21122302412.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×21420322112² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420322117) 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, 1651589 + ... + 1664507.

Almost surely, 2^21420322112 is an apocalyptic number.

It is an amenable number.

21420322112 is an abundant number, since it is smaller than the sum of its proper divisors (27174795328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21420322112 is a wasteful number, since it uses less digits than its factorization.

21420322112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16639 (or 16629 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21420322112 its reverse (21122302412), we get a palindrome (42542624524).

The spelling of 21420322112 in words is "twenty-one billion, four hundred twenty million, three hundred twenty-two thousand, one hundred twelve".