21214036536404 has 6 divisors (see below), whose sum is σ = 37124563938714. Its totient is φ = 10607018268200.

The previous prime is 21214036536403. The next prime is 21214036536449. The reversal of 21214036536404 is 40463563041212.

It can be written as a sum of positive squares in only one way, i.e., 18687049413904 + 2526987122500 = 4322852^2 + 1589650^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214036536401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2651754567047 + ... + 2651754567054.

It is an arithmetic number, because the mean of its divisors is an integer number (6187427323119).

Almost surely, 2^{21214036536404} is an apocalyptic number.

It is an amenable number.

21214036536404 is a deficient number, since it is larger than the sum of its proper divisors (15910527402310).

21214036536404 is a wasteful number, since it uses less digits than its factorization.

21214036536404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5303509134105 (or 5303509134103 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 41.

Adding to 21214036536404 its reverse (40463563041212), we get a palindrome (61677599577616).

The spelling of 21214036536404 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, four hundred four".