21290509262 has 24 divisors (see below), whose sum is σ = 35678429976. Its totient is φ = 9518850000.

The previous prime is 21290509259. The next prime is 21290509267. The reversal of 21290509262 is 26290509212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21290509267) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 706364 + ... + 735887.

It is an arithmetic number, because the mean of its divisors is an integer number (1486601249).

Almost surely, 2^21290509262 is an apocalyptic number.

21290509262 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21290509262 is a deficient number, since it is larger than the sum of its proper divisors (14387920714).

21290509262 is a wasteful number, since it uses less digits than its factorization.

21290509262 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442336 (or 1442325 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

It can be divided in two parts, 2129050 and 9262, that added together give a palindrome (2138312).

The spelling of 21290509262 in words is "twenty-one billion, two hundred ninety million, five hundred nine thousand, two hundred sixty-two".