21402400240012 has 12 divisors (see below), whose sum is σ = 40859127731016. Its totient is φ = 9728363745440.

The previous prime is 21402400240007. The next prime is 21402400240021. The reversal of 21402400240012 is 21004200420412.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243209093593 + ... + 243209093680.

It is an arithmetic number, because the mean of its divisors is an integer number (3404927310918).

Almost surely, 2^{21402400240012} is an apocalyptic number.

21402400240012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21402400240012 is a deficient number, since it is larger than the sum of its proper divisors (19456727491004).

21402400240012 is a wasteful number, since it uses less digits than its factorization.

21402400240012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486418187288 (or 486418187286 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21402400240012 its reverse (21004200420412), we get a palindrome (42406600660424).

The spelling of 21402400240012 in words is "twenty-one trillion, four hundred two billion, four hundred million, two hundred forty thousand, twelve".