21453420352042 has 32 divisors (see below), whose sum is σ = 36968560807680. Its totient is φ = 9146611031040.

The previous prime is 21453420352019. The next prime is 21453420352057. The reversal of 21453420352042 is 24025302435412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21453420351992 and 21453420352010.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1936567 + ... + 6830602.

It is an arithmetic number, because the mean of its divisors is an integer number (1155267525240).

Almost surely, 2^{21453420352042} is an apocalyptic number.

21453420352042 is a deficient number, since it is larger than the sum of its proper divisors (15515140455638).

21453420352042 is a wasteful number, since it uses less digits than its factorization.

21453420352042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8768086.

The product of its (nonzero) digits is 230400, while the sum is 37.

Adding to 21453420352042 its reverse (24025302435412), we get a palindrome (45478722787454).

The spelling of 21453420352042 in words is "twenty-one trillion, four hundred fifty-three billion, four hundred twenty million, three hundred fifty-two thousand, forty-two".