21030120034 has 32 divisors (see below), whose sum is σ = 39336435072. Its totient is φ = 8192016000.

The previous prime is 21030120031. The next prime is 21030120091. The reversal of 21030120034 is 43002103012.

It is a happy number.

It is a super-2 number, since 2×21030120034² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21030120031) 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, 1155364 + ... + 1173424.

It is an arithmetic number, because the mean of its divisors is an integer number (1229263596).

Almost surely, 2^21030120034 is an apocalyptic number.

21030120034 is a deficient number, since it is larger than the sum of its proper divisors (18306315038).

21030120034 is a wasteful number, since it uses less digits than its factorization.

21030120034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25642.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21030120034 its reverse (43002103012), we get a palindrome (64032223046).

The spelling of 21030120034 in words is "twenty-one billion, thirty million, one hundred twenty thousand, thirty-four".