802123821 has 12 divisors (see below), whose sum is σ = 1178261760. Its totient is φ = 525685320.

The previous prime is 802123793. The next prime is 802123823. The reversal of 802123821 is 128321208.

It is not a de Polignac number, because 802123821 - 2⁶ = 802123757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (802123823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 754765 + ... + 755826.

It is an arithmetic number, because the mean of its divisors is an integer number (98188480).

Almost surely, 2^802123821 is an apocalyptic number.

It is an amenable number.

802123821 is a deficient number, since it is larger than the sum of its proper divisors (376137939).

802123821 is a wasteful number, since it uses less digits than its factorization.

802123821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510656 (or 1510653 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 802123821 is about 28321.7905683945. The cubic root of 802123821 is about 929.1385328202.

The spelling of 802123821 in words is "eight hundred two million, one hundred twenty-three thousand, eight hundred twenty-one".