21145440402 has 48 divisors (see below), whose sum is σ = 48344325120. Its totient is φ = 6666259776.

The previous prime is 21145440401. The next prime is 21145440403. The reversal of 21145440402 is 20404454112.

21145440402 is a `hidden beast` number, since 2 + 114 + 544 + 0 + 4 + 0 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21145440401) and next prime (21145440403).

It is not an unprimeable number, because it can be changed into a prime (21145440401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 250098 + ... + 323789.

It is an arithmetic number, because the mean of its divisors is an integer number (1007173440).

Almost surely, 2^21145440402 is an apocalyptic number.

21145440402 is an abundant number, since it is smaller than the sum of its proper divisors (27198884718).

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

21145440402 is a wasteful number, since it uses less digits than its factorization.

21145440402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574007 (or 574004 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

Adding to 21145440402 its reverse (20404454112), we get a palindrome (41549894514).

The spelling of 21145440402 in words is "twenty-one billion, one hundred forty-five million, four hundred forty thousand, four hundred two".