21121310361452 has 48 divisors (see below), whose sum is σ = 42939412535040. Its totient is φ = 8902707278400.

The previous prime is 21121310361451. The next prime is 21121310361457. The reversal of 21121310361452 is 25416301312112.

It is a super-2 number, since 2×21121310361452² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121310361451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16622699 + ... + 17848157.

It is an arithmetic number, because the mean of its divisors is an integer number (894571094480).

Almost surely, 2^{21121310361452} is an apocalyptic number.

It is an amenable number.

21121310361452 is an abundant number, since it is smaller than the sum of its proper divisors (21818102173588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21121310361452 is a wasteful number, since it uses less digits than its factorization.

21121310361452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235622 (or 1235620 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

Adding to 21121310361452 its reverse (25416301312112), we get a palindrome (46537611673564).

The spelling of 21121310361452 in words is "twenty-one trillion, one hundred twenty-one billion, three hundred ten million, three hundred sixty-one thousand, four hundred fifty-two".