21342011240 has 32 divisors (see below), whose sum is σ = 52384937760. Its totient is φ = 7760731200.

The previous prime is 21342011237. The next prime is 21342011263. The reversal of 21342011240 is 4211024312.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24251846 + ... + 24252725.

It is an arithmetic number, because the mean of its divisors is an integer number (1637029305).

Almost surely, 2^21342011240 is an apocalyptic number.

21342011240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21342011240 is an abundant number, since it is smaller than the sum of its proper divisors (31042926520).

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

21342011240 is a wasteful number, since it uses less digits than its factorization.

21342011240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48504593 (or 48504589 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21342011240 its reverse (4211024312), we get a palindrome (25553035552).

The spelling of 21342011240 in words is "twenty-one billion, three hundred forty-two million, eleven thousand, two hundred forty".