21502121325142 has 16 divisors (see below), whose sum is σ = 32356881200592. Its totient is φ = 10716498355680.

The previous prime is 21502121325079. The next prime is 21502121325241. The reversal of 21502121325142 is 24152312120512.

It is a super-3 number, since 3×21502121325142³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9567517 + ... + 11599207.

It is an arithmetic number, because the mean of its divisors is an integer number (2022305075037).

Almost surely, 2^{21502121325142} is an apocalyptic number.

21502121325142 is a deficient number, since it is larger than the sum of its proper divisors (10854759875450).

21502121325142 is a wasteful number, since it uses less digits than its factorization.

21502121325142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2048703.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 21502121325142 its reverse (24152312120512), we get a palindrome (45654433445654).

The spelling of 21502121325142 in words is "twenty-one trillion, five hundred two billion, one hundred twenty-one million, three hundred twenty-five thousand, one hundred forty-two".