21424402002 has 64 divisors (see below), whose sum is σ = 44992558080. Its totient is φ = 6793036800.

The previous prime is 21424401991. The next prime is 21424402003. The reversal of 21424402002 is 20020442412.

It is a super-2 number, since 2×21424402002² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21424402002.

It is not an unprimeable number, because it can be changed into a prime (21424402003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2860102 + ... + 2867582.

It is an arithmetic number, because the mean of its divisors is an integer number (703008720).

Almost surely, 2^21424402002 is an apocalyptic number.

21424402002 is an abundant number, since it is smaller than the sum of its proper divisors (23568156078).

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

21424402002 is a wasteful number, since it uses less digits than its factorization.

21424402002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7779.

The product of its (nonzero) digits is 1024, while the sum is 21.

Adding to 21424402002 its reverse (20020442412), we get a palindrome (41444844414).

The spelling of 21424402002 in words is "twenty-one billion, four hundred twenty-four million, four hundred two thousand, two".