21534415210042 has 16 divisors (see below), whose sum is σ = 36926478205632. Its totient is φ = 9226450628640.

The previous prime is 21534415210031. The next prime is 21534415210051. The reversal of 21534415210042 is 24001251443512.

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, 215320003 + ... + 215419990.

It is an arithmetic number, because the mean of its divisors is an integer number (2307904887852).

Almost surely, 2^{21534415210042} is an apocalyptic number.

21534415210042 is a deficient number, since it is larger than the sum of its proper divisors (15392062995590).

21534415210042 is a wasteful number, since it uses less digits than its factorization.

21534415210042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430743573.

The product of its (nonzero) digits is 38400, while the sum is 34.

Adding to 21534415210042 its reverse (24001251443512), we get a palindrome (45535666653554).

The spelling of 21534415210042 in words is "twenty-one trillion, five hundred thirty-four billion, four hundred fifteen million, two hundred ten thousand, forty-two".