1102638421 has 2 divisors, whose sum is σ = 1102638422. Its totient is φ = 1102638420.

The previous prime is 1102638413. The next prime is 1102638437. The reversal of 1102638421 is 1248362011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1096338321 + 6300100 = 33111^2 + 2510^2 .

It is a cyclic number.

It is not a de Polignac number, because 1102638421 - 2³ = 1102638413 is a prime.

It is a super-2 number, since 2×1102638421² = 2431622974930746482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1102638421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1102638401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 551319210 + 551319211.

It is an arithmetic number, because the mean of its divisors is an integer number (551319211).

Almost surely, 2^1102638421 is an apocalyptic number.

It is an amenable number.

1102638421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1102638421 is an equidigital number, since it uses as much as digits as its factorization.

1102638421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 1102638421 is about 33205.9997741372. Note that the first 3 decimals coincide. The cubic root of 1102638421 is about 1033.1047866270.

The spelling of 1102638421 in words is "one billion, one hundred two million, six hundred thirty-eight thousand, four hundred twenty-one".