21340764834 has 16 divisors (see below), whose sum is σ = 42684660480. Its totient is φ = 7113066480.

The previous prime is 21340764811. The next prime is 21340764857. The reversal of 21340764834 is 43846704312.

It is an interprime number because it is at equal distance from previous prime (21340764811) and next prime (21340764857).

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, 36649 + ... + 209820.

It is an arithmetic number, because the mean of its divisors is an integer number (2667791280).

Almost surely, 2^21340764834 is an apocalyptic number.

21340764834 is an abundant number, since it is smaller than the sum of its proper divisors (21343895646).

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

21340764834 is a wasteful number, since it uses less digits than its factorization.

21340764834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260905.

The product of its (nonzero) digits is 387072, while the sum is 42.

The spelling of 21340764834 in words is "twenty-one billion, three hundred forty million, seven hundred sixty-four thousand, eight hundred thirty-four".