21145450151 has 24 divisors (see below), whose sum is σ = 25932314160. Its totient is φ = 17144265600.

The previous prime is 21145450127. The next prime is 21145450163. The reversal of 21145450151 is 15105454112.

It is not a de Polignac number, because 21145450151 - 2²² = 21141255847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21145450171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 598211 + ... + 632571.

It is an arithmetic number, because the mean of its divisors is an integer number (1080513090).

Almost surely, 2^21145450151 is an apocalyptic number.

21145450151 is a deficient number, since it is larger than the sum of its proper divisors (4786864009).

21145450151 is a wasteful number, since it uses less digits than its factorization.

21145450151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35055 (or 35048 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 29.

The spelling of 21145450151 in words is "twenty-one billion, one hundred forty-five million, four hundred fifty thousand, one hundred fifty-one".