21145133051 has 8 divisors (see below), whose sum is σ = 24999172320. Its totient is φ = 17499420288.

The previous prime is 21145133033. The next prime is 21145133059. The reversal of 21145133051 is 15033154112.

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

It is not a de Polignac number, because 21145133051 - 2¹⁰ = 21145132027 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21145133051.

It is not an unprimeable number, because it can be changed into a prime (21145133059) 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, 52081406 + ... + 52081811.

It is an arithmetic number, because the mean of its divisors is an integer number (3124896540).

Almost surely, 2^21145133051 is an apocalyptic number.

21145133051 is a deficient number, since it is larger than the sum of its proper divisors (3854039269).

21145133051 is a wasteful number, since it uses less digits than its factorization.

21145133051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104163253.

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 21145133051 its reverse (15033154112), we get a palindrome (36178287163).

The spelling of 21145133051 in words is "twenty-one billion, one hundred forty-five million, one hundred thirty-three thousand, fifty-one".