1021721475410 has 32 divisors (see below), whose sum is σ = 1888953530112. Its totient is φ = 397611478080.

The previous prime is 1021721475409. The next prime is 1021721475419. The reversal of 1021721475410 is 145741271201.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1021721475419) 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, 4878755 + ... + 5083865.

It is an arithmetic number, because the mean of its divisors is an integer number (59029797816).

Almost surely, 2^{1021721475410} is an apocalyptic number.

1021721475410 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1021721475410 is a deficient number, since it is larger than the sum of its proper divisors (867232054702).

1021721475410 is a wasteful number, since it uses less digits than its factorization.

1021721475410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218618.

The product of its (nonzero) digits is 15680, while the sum is 35.

The spelling of 1021721475410 in words is "one trillion, twenty-one billion, seven hundred twenty-one million, four hundred seventy-five thousand, four hundred ten".