1102078021 has 4 divisors (see below), whose sum is σ = 1202266944. Its totient is φ = 1001889100.

The previous prime is 1102077983. The next prime is 1102078027. The reversal of 1102078021 is 1208702011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1208702011 = 11 ⋅109882001.

It is a cyclic number.

It is not a de Polignac number, because 1102078021 - 2¹¹ = 1102075973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1102077983 and 1102078001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1102078027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50094445 + ... + 50094466.

It is an arithmetic number, because the mean of its divisors is an integer number (300566736).

Almost surely, 2^1102078021 is an apocalyptic number.

1102078021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1102078021 is a deficient number, since it is larger than the sum of its proper divisors (100188923).

1102078021 is a wasteful number, since it uses less digits than its factorization.

1102078021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100188922.

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 1102078021 is about 33197.5604676006. The cubic root of 1102078021 is about 1032.9297367889.

The spelling of 1102078021 in words is "one billion, one hundred two million, seventy-eight thousand, twenty-one".