21121472134372 has 96 divisors (see below), whose sum is σ = 39986364023424. Its totient is φ = 9726485760000.

The previous prime is 21121472134369. The next prime is 21121472134381. The reversal of 21121472134372 is 27343127412112.

It is a super-2 number, since 2×21121472134372² (a number of 27 digits) contains 22 as substring.

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, 256371378 + ... + 256453750.

It is an arithmetic number, because the mean of its divisors is an integer number (416524625244).

Almost surely, 2^{21121472134372} is an apocalyptic number.

It is an amenable number.

21121472134372 is a deficient number, since it is larger than the sum of its proper divisors (18864891889052).

21121472134372 is a wasteful number, since it uses less digits than its factorization.

21121472134372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82909 (or 82907 counting only the distinct ones).

The product of its digits is 112896, while the sum is 40.

Adding to 21121472134372 its reverse (27343127412112), we get a palindrome (48464599546484).

The spelling of 21121472134372 in words is "twenty-one trillion, one hundred twenty-one billion, four hundred seventy-two million, one hundred thirty-four thousand, three hundred seventy-two".