21342013400 has 24 divisors (see below), whose sum is σ = 49620181620. Its totient is φ = 8536805280.

The previous prime is 21342013393. The next prime is 21342013411. The reversal of 21342013400 is 431024312.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 53354834 + ... + 53355233.

Almost surely, 2^21342013400 is an apocalyptic number.

21342013400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21342013400 is an abundant number, since it is smaller than the sum of its proper divisors (28278168220).

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

21342013400 is a wasteful number, since it uses less digits than its factorization.

21342013400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106710083 (or 106710074 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21342013400 its reverse (431024312), we get a palindrome (21773037712).

The spelling of 21342013400 in words is "twenty-one billion, three hundred forty-two million, thirteen thousand, four hundred".