21033402051 has 16 divisors (see below), whose sum is σ = 28317864960. Its totient is φ = 13886052960.

The previous prime is 21033402041. The next prime is 21033402073. The reversal of 21033402051 is 15020433012.

It is not a de Polignac number, because 21033402051 - 2¹⁰ = 21033401027 is a prime.

It is a super-2 number, since 2×21033402051² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21033402041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132381 + ... + 244113.

It is an arithmetic number, because the mean of its divisors is an integer number (1769866560).

Almost surely, 2^21033402051 is an apocalyptic number.

21033402051 is a deficient number, since it is larger than the sum of its proper divisors (7284462909).

21033402051 is a wasteful number, since it uses less digits than its factorization.

21033402051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112346.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 21033402051 its reverse (15020433012), we get a palindrome (36053835063).

The spelling of 21033402051 in words is "twenty-one billion, thirty-three million, four hundred two thousand, fifty-one".