21150420434 has 16 divisors (see below), whose sum is σ = 37272070080. Its totient is φ = 8874302160.

The previous prime is 21150420419. The next prime is 21150420479. The reversal of 21150420434 is 43402405112.

21150420434 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36975974 + ... + 36976545.

It is an arithmetic number, because the mean of its divisors is an integer number (2329504380).

Almost surely, 2^21150420434 is an apocalyptic number.

21150420434 is a deficient number, since it is larger than the sum of its proper divisors (16121649646).

21150420434 is a wasteful number, since it uses less digits than its factorization.

21150420434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73952545.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 21150420434 its reverse (43402405112), we get a palindrome (64552825546).

The spelling of 21150420434 in words is "twenty-one billion, one hundred fifty million, four hundred twenty thousand, four hundred thirty-four".