21242040402 has 32 divisors (see below), whose sum is σ = 48361328640. Its totient is φ = 6157112720.

The previous prime is 21242040401. The next prime is 21242040409. The reversal of 21242040402 is 20404024212.

It is not an unprimeable number, because it can be changed into a prime (21242040401) 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 15 ways as a sum of consecutive naturals, for example, 6995202 + ... + 6998237.

It is an arithmetic number, because the mean of its divisors is an integer number (1511291520).

Almost surely, 2^21242040402 is an apocalyptic number.

21242040402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21242040402 is an abundant number, since it is smaller than the sum of its proper divisors (27119288238).

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

21242040402 is a wasteful number, since it uses less digits than its factorization.

21242040402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13993478.

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

Adding to 21242040402 its reverse (20404024212), we get a palindrome (41646064614).

The spelling of 21242040402 in words is "twenty-one billion, two hundred forty-two million, forty thousand, four hundred two".