21263162004 has 36 divisors (see below), whose sum is σ = 61426913184. Its totient is φ = 6075189072.

The previous prime is 21263162003. The next prime is 21263162017. The reversal of 21263162004 is 40026136212.

21263162004 is a `hidden beast` number, since 2 + 1 + 2 + 6 + 31 + 620 + 0 + 4 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21263162003) 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, 42188562 + ... + 42189065.

It is an arithmetic number, because the mean of its divisors is an integer number (1706303144).

Almost surely, 2^21263162004 is an apocalyptic number.

It is an amenable number.

21263162004 is an abundant number, since it is smaller than the sum of its proper divisors (40163751180).

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

21263162004 is a wasteful number, since it uses less digits than its factorization.

21263162004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84377644 (or 84377639 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 21263162004 its reverse (40026136212), we get a palindrome (61289298216).

The spelling of 21263162004 in words is "twenty-one billion, two hundred sixty-three million, one hundred sixty-two thousand, four".