21053153451 has 8 divisors (see below), whose sum is σ = 30622768704. Its totient is φ = 12759486920.

The previous prime is 21053153437. The next prime is 21053153453. The reversal of 21053153451 is 15435135012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21053153451 - 2¹³ = 21053145259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21053153453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318987141 + ... + 318987206.

It is an arithmetic number, because the mean of its divisors is an integer number (3827846088).

Almost surely, 2^21053153451 is an apocalyptic number.

21053153451 is a deficient number, since it is larger than the sum of its proper divisors (9569615253).

21053153451 is a wasteful number, since it uses less digits than its factorization.

21053153451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637974361.

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 21053153451 its reverse (15435135012), we get a palindrome (36488288463).

The spelling of 21053153451 in words is "twenty-one billion, fifty-three million, one hundred fifty-three thousand, four hundred fifty-one".