21033651642 has 32 divisors (see below), whose sum is σ = 44548056000. Its totient is φ = 6597873408.

The previous prime is 21033651623. The next prime is 21033651647. The reversal of 21033651642 is 24615633012.

It is not an unprimeable number, because it can be changed into a prime (21033651647) 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, 1423609 + ... + 1438307.

It is an arithmetic number, because the mean of its divisors is an integer number (1392126750).

Almost surely, 2^21033651642 is an apocalyptic number.

21033651642 is an abundant number, since it is smaller than the sum of its proper divisors (23514404358).

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

21033651642 is a wasteful number, since it uses less digits than its factorization.

21033651642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28750.

The product of its (nonzero) digits is 25920, while the sum is 33.

The spelling of 21033651642 in words is "twenty-one billion, thirty-three million, six hundred fifty-one thousand, six hundred forty-two".