21004151455 has 8 divisors (see below), whose sum is σ = 28805693472. Its totient is φ = 14402846688.

The previous prime is 21004151431. The next prime is 21004151459. The reversal of 21004151455 is 55415140012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21004151455 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004151459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300059272 + ... + 300059341.

It is an arithmetic number, because the mean of its divisors is an integer number (3600711684).

Almost surely, 2^21004151455 is an apocalyptic number.

21004151455 is a deficient number, since it is larger than the sum of its proper divisors (7801542017).

21004151455 is an equidigital number, since it uses as much as digits as its factorization.

21004151455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600118625.

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 21004151455 its reverse (55415140012), we get a palindrome (76419291467).

The spelling of 21004151455 in words is "twenty-one billion, four million, one hundred fifty-one thousand, four hundred fifty-five".