21250640262 has 8 divisors (see below), whose sum is σ = 42501280536. Its totient is φ = 7083546752.

The previous prime is 21250640251. The next prime is 21250640287. The reversal of 21250640262 is 26204605212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

21250640262 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1770886683 + ... + 1770886694.

It is an arithmetic number, because the mean of its divisors is an integer number (5312660067).

Almost surely, 2^21250640262 is an apocalyptic number.

21250640262 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21250640262 is a wasteful number, since it uses less digits than its factorization.

21250640262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3541773382.

The product of its (nonzero) digits is 11520, while the sum is 30.

The spelling of 21250640262 in words is "twenty-one billion, two hundred fifty million, six hundred forty thousand, two hundred sixty-two".