21267369490 has 32 divisors (see below), whose sum is σ = 39331447344. Its totient is φ = 8273756160.

The previous prime is 21267369437. The next prime is 21267369491. The reversal of 21267369490 is 9496376212.

It can be written as a sum of positive squares in 8 ways, for example, as 2830346401 + 18437023089 = 53201^2 + 135783^2 .

It is not an unprimeable number, because it can be changed into a prime (21267369491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1061970 + ... + 1081810.

Almost surely, 2^21267369490 is an apocalyptic number.

21267369490 is a deficient number, since it is larger than the sum of its proper divisors (18064077854).

21267369490 is a wasteful number, since it uses less digits than its factorization.

21267369490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22782.

The product of its (nonzero) digits is 979776, while the sum is 49.

The spelling of 21267369490 in words is "twenty-one billion, two hundred sixty-seven million, three hundred sixty-nine thousand, four hundred ninety".