21225112045516 has 48 divisors (see below), whose sum is σ = 38135991140352. Its totient is φ = 10331525332800.

The previous prime is 21225112045507. The next prime is 21225112045573. The reversal of 21225112045516 is 61554021152212.

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, 837038710 + ... + 837064066.

It is an arithmetic number, because the mean of its divisors is an integer number (794499815424).

Almost surely, 2^{21225112045516} is an apocalyptic number.

It is an amenable number.

21225112045516 is a deficient number, since it is larger than the sum of its proper divisors (16910879094836).

21225112045516 is a wasteful number, since it uses less digits than its factorization.

21225112045516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48910 (or 48908 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 37.

Adding to 21225112045516 its reverse (61554021152212), we get a palindrome (82779133197728).

The spelling of 21225112045516 in words is "twenty-one trillion, two hundred twenty-five billion, one hundred twelve million, forty-five thousand, five hundred sixteen".