21250141668 has 60 divisors (see below), whose sum is σ = 63488084352. Its totient is φ = 6071468400.

The previous prime is 21250141667. The next prime is 21250141681. The reversal of 21250141668 is 86614105212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21250141667) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4682508 + ... + 4687043.

Almost surely, 2^21250141668 is an apocalyptic number.

21250141668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21250141668 is an abundant number, since it is smaller than the sum of its proper divisors (42237942684).

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

21250141668 is a wasteful number, since it uses less digits than its factorization.

21250141668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9369574 (or 9369563 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 21250141668 in words is "twenty-one billion, two hundred fifty million, one hundred forty-one thousand, six hundred sixty-eight".