21122051451 has 8 divisors (see below), whose sum is σ = 28182203904. Its totient is φ = 14071633320.

The previous prime is 21122051441. The next prime is 21122051471. The reversal of 21122051451 is 15415022112.

It is a happy number.

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

It is not a de Polignac number, because 21122051451 - 2¹⁵ = 21122018683 is a prime.

It is a super-2 number, since 2×21122051451² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122051411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2428515 + ... + 2437196.

It is an arithmetic number, because the mean of its divisors is an integer number (3522775488).

Almost surely, 2^21122051451 is an apocalyptic number.

21122051451 is a deficient number, since it is larger than the sum of its proper divisors (7060152453).

21122051451 is a wasteful number, since it uses less digits than its factorization.

21122051451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4867161.

The product of its (nonzero) digits is 800, while the sum is 24.

Adding to 21122051451 its reverse (15415022112), we get a palindrome (36537073563).

The spelling of 21122051451 in words is "twenty-one billion, one hundred twenty-two million, fifty-one thousand, four hundred fifty-one".