21045151455 has 48 divisors (see below), whose sum is σ = 35396795616. Its totient is φ = 10676033280.

The previous prime is 21045151451. The next prime is 21045151471. The reversal of 21045151455 is 55415154012.

It is a happy number.

It is not a de Polignac number, because 21045151455 - 2² = 21045151451 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21045151451) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1428909 + ... + 1443561.

It is an arithmetic number, because the mean of its divisors is an integer number (737433242).

Almost surely, 2^21045151455 is an apocalyptic number.

21045151455 is a deficient number, since it is larger than the sum of its proper divisors (14351644161).

21045151455 is a wasteful number, since it uses less digits than its factorization.

21045151455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14888 (or 14865 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 33.

The spelling of 21045151455 in words is "twenty-one billion, forty-five million, one hundred fifty-one thousand, four hundred fifty-five".