21121322542052 has 12 divisors (see below), whose sum is σ = 36987071535036. Its totient is φ = 10553587817760.

The previous prime is 21121322542031. The next prime is 21121322542057. The reversal of 21121322542052 is 25024522312112.

It can be written as a sum of positive squares in 2 ways, for example, as 20049385343716 + 1071937198336 = 4477654^2 + 1035344^2 .

It is a super-2 number, since 2×21121322542052² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121322542057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1768356599 + ... + 1768368542.

It is an arithmetic number, because the mean of its divisors is an integer number (3082255961253).

Almost surely, 2^{21121322542052} is an apocalyptic number.

It is an amenable number.

21121322542052 is a deficient number, since it is larger than the sum of its proper divisors (15865748992984).

21121322542052 is a wasteful number, since it uses less digits than its factorization.

21121322542052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3536726638 (or 3536726636 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 21121322542052 its reverse (25024522312112), we get a palindrome (46145844854164).

The spelling of 21121322542052 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred twenty-two million, five hundred forty-two thousand, fifty-two".