21001552343452 has 12 divisors (see below), whose sum is σ = 37746033266200. Its totient is φ = 10216971410256.

The previous prime is 21001552343441. The next prime is 21001552343483. The reversal of 21001552343452 is 25434325510012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70951190202 + ... + 70951190497.

Almost surely, 2^{21001552343452} is an apocalyptic number.

It is an amenable number.

21001552343452 is a deficient number, since it is larger than the sum of its proper divisors (16744480922748).

21001552343452 is a wasteful number, since it uses less digits than its factorization.

21001552343452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141902380740 (or 141902380738 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

Adding to 21001552343452 its reverse (25434325510012), we get a palindrome (46435877853464).

The spelling of 21001552343452 in words is "twenty-one trillion, one billion, five hundred fifty-two million, three hundred forty-three thousand, four hundred fifty-two".