21445356090 has 32 divisors (see below), whose sum is σ = 51478603776. Its totient is φ = 5717678400.

The previous prime is 21445356089. The next prime is 21445356137. The reversal of 21445356090 is 9065354412.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100140 + ... + 230040.

It is an arithmetic number, because the mean of its divisors is an integer number (1608706368).

Almost surely, 2^21445356090 is an apocalyptic number.

21445356090 is an abundant number, since it is smaller than the sum of its proper divisors (30033247686).

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

21445356090 is a wasteful number, since it uses less digits than its factorization.

21445356090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135414.

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 21445356090 in words is "twenty-one billion, four hundred forty-five million, three hundred fifty-six thousand, ninety".