21225003768942 has 16 divisors (see below), whose sum is σ = 42450058789632. Its totient is φ = 7074992714360.

The previous prime is 21225003768931. The next prime is 21225003768961. The reversal of 21225003768942 is 24986730052212.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5171467 + ... + 8318297.

It is an arithmetic number, because the mean of its divisors is an integer number (2653128674352).

It is a 1-persistent number, because it is pandigital, but 2⋅21225003768942 = 42450007537884 is not.

Almost surely, 2^{21225003768942} is an apocalyptic number.

21225003768942 is an abundant number, since it is smaller than the sum of its proper divisors (21225055020690).

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

21225003768942 is a wasteful number, since it uses less digits than its factorization.

21225003768942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4270983.

The product of its (nonzero) digits is 2903040, while the sum is 51.

The spelling of 21225003768942 in words is "twenty-one trillion, two hundred twenty-five billion, three million, seven hundred sixty-eight thousand, nine hundred forty-two".