21164210762 has 4 divisors (see below), whose sum is σ = 31746316146. Its totient is φ = 10582105380.

The previous prime is 21164210729. The next prime is 21164210773. The reversal of 21164210762 is 26701246112.

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., 12343432201 + 8820778561 = 111101^2 + 93919^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5291052689 + ... + 5291052692.

Almost surely, 2^21164210762 is an apocalyptic number.

21164210762 is a deficient number, since it is larger than the sum of its proper divisors (10582105384).

21164210762 is a wasteful number, since it uses less digits than its factorization.

21164210762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10582105383.

The product of its (nonzero) digits is 8064, while the sum is 32.

Adding to 21164210762 its reverse (26701246112), we get a palindrome (47865456874).

The spelling of 21164210762 in words is "twenty-one billion, one hundred sixty-four million, two hundred ten thousand, seven hundred sixty-two".