21345041225442 has 64 divisors (see below), whose sum is σ = 46933089504768. Its totient is φ = 6418089216000.

The previous prime is 21345041225437. The next prime is 21345041225591. The reversal of 21345041225442 is 24452214054312.

It is a super-2 number, since 2×21345041225442² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21345041225442.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2294178 + ... + 6924834.

It is an arithmetic number, because the mean of its divisors is an integer number (733329523512).

Almost surely, 2^{21345041225442} is an apocalyptic number.

21345041225442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21345041225442 is an abundant number, since it is smaller than the sum of its proper divisors (25588048279326).

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

21345041225442 is a wasteful number, since it uses less digits than its factorization.

21345041225442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4631215.

The product of its (nonzero) digits is 307200, while the sum is 39.

Adding to 21345041225442 its reverse (24452214054312), we get a palindrome (45797255279754).

The spelling of 21345041225442 in words is "twenty-one trillion, three hundred forty-five billion, forty-one million, two hundred twenty-five thousand, four hundred forty-two".