21033234546 has 16 divisors (see below), whose sum is σ = 42860176704. Its totient is φ = 6878793584.

The previous prime is 21033234539. The next prime is 21033234553. The reversal of 21033234546 is 64543233012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21033234539) and next prime (21033234553).

It is a super-2 number, since 2×21033234546² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33070806 + ... + 33071441.

It is an arithmetic number, because the mean of its divisors is an integer number (2678761044).

Almost surely, 2^21033234546 is an apocalyptic number.

21033234546 is an abundant number, since it is smaller than the sum of its proper divisors (21826942158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21033234546 is a wasteful number, since it uses less digits than its factorization.

21033234546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66142305.

The product of its (nonzero) digits is 51840, while the sum is 33.

Adding to 21033234546 its reverse (64543233012), we get a palindrome (85576467558).

The spelling of 21033234546 in words is "twenty-one billion, thirty-three million, two hundred thirty-four thousand, five hundred forty-six".