21420002412 has 36 divisors (see below), whose sum is σ = 56994745080. Its totient is φ = 6764211072.

The previous prime is 21420002411. The next prime is 21420002437.

21420002412 is a `hidden beast` number, since 2 + 1 + 420 + 0 + 0 + 241 + 2 = 666.

21420002412 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21420002411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15657213 + ... + 15658580.

Almost surely, 2^21420002412 is an apocalyptic number.

It is an amenable number.

21420002412 is an abundant number, since it is smaller than the sum of its proper divisors (35574742668).

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

21420002412 is a wasteful number, since it uses less digits than its factorization.

21420002412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31315822 (or 31315817 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

It can be divided in two parts, 2142000 and 2412, that added together give a palindrome (2144412).

The spelling of 21420002412 in words is "twenty-one billion, four hundred twenty million, two thousand, four hundred twelve".