21351345034 has 4 divisors (see below), whose sum is σ = 32027017554. Its totient is φ = 10675672516.

The previous prime is 21351345031. The next prime is 21351345047. The reversal of 21351345034 is 43054315312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15638252809 + 5713092225 = 125053^2 + 75585^2 .

It is a super-2 number, since 2×21351345034² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21351344987 and 21351345005.

It is not an unprimeable number, because it can be changed into a prime (21351345031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5337836257 + ... + 5337836260.

Almost surely, 2^21351345034 is an apocalyptic number.

21351345034 is a deficient number, since it is larger than the sum of its proper divisors (10675672520).

21351345034 is a wasteful number, since it uses less digits than its factorization.

21351345034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10675672519.

The product of its (nonzero) digits is 21600, while the sum is 31.

The spelling of 21351345034 in words is "twenty-one billion, three hundred fifty-one million, three hundred forty-five thousand, thirty-four".