21210120034 has 8 divisors (see below), whose sum is σ = 31815917568. Its totient is φ = 10604814180.

The previous prime is 21210120017. The next prime is 21210120037. The reversal of 21210120034 is 43002101212.

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

It is a super-2 number, since 2×21210120034² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21210120037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16599 + ... + 206629.

It is an arithmetic number, because the mean of its divisors is an integer number (3976989696).

Almost surely, 2^21210120034 is an apocalyptic number.

21210120034 is a deficient number, since it is larger than the sum of its proper divisors (10605797534).

21210120034 is a wasteful number, since it uses less digits than its factorization.

21210120034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245840.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21210120034 its reverse (43002101212), we get a palindrome (64212221246).

The spelling of 21210120034 in words is "twenty-one billion, two hundred ten million, one hundred twenty thousand, thirty-four".