21004314356 has 6 divisors (see below), whose sum is σ = 36757550130. Its totient is φ = 10502157176.

The previous prime is 21004314347. The next prime is 21004314467. The reversal of 21004314356 is 65341340012.

It can be written as a sum of positive squares in only one way, i.e., 15310102756 + 5694211600 = 123734^2 + 75460^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625539291 + ... + 2625539298.

It is an arithmetic number, because the mean of its divisors is an integer number (6126258355).

Almost surely, 2^21004314356 is an apocalyptic number.

It is an amenable number.

21004314356 is a deficient number, since it is larger than the sum of its proper divisors (15753235774).

21004314356 is a wasteful number, since it uses less digits than its factorization.

21004314356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5251078593 (or 5251078591 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 21004314356 its reverse (65341340012), we get a palindrome (86345654368).

The spelling of 21004314356 in words is "twenty-one billion, four million, three hundred fourteen thousand, three hundred fifty-six".